The Boomsday Project

The Boomsday Project is a Hearthstone patch released on Aug. 2, 2018. It was versioned 12.0.0 with the build number 25770. It was released during the expansion Legacy

Card Changes

New Collectible Cards

New cards have been added to the game.

New Druid Cards

  • Flobbidinous Floop - Of all the scientists, he has the most knowledge (when measured in volume).
  • Floop's Glorious Gloop - How much gloop could Floop's Gloop gloop if Floop's Gloop could gloop gloop?
  • Dreampetal Florist - Unlike gnomes, dreampetals grow more than 3 feet tall.
  • Juicy Psychmelon - It's not juicy at all. IT'S JUST MESSING WITH YOUR HEAD.
  • Mulchmuncher - The latest advancement in hippo-botany.
  • Tending Tauren - That racial bonus to Herbalism finally paid off.
  • Dendrologist - He's teaching his little buddy to talk, but all it says is, "I am Gloop."
  • Gloop Sprayer - "Are you sure that's enough gloop?" "Hold on."
  • Landscaping - We'll put a happy tree right here... and give him a little friend.
  • Biology Project - Step 1: Grow giant evil strawberry. Step 2: ???? Step 3: Rule Azeroth!

New Hunter Cards

New Mage Cards

  • Luna's Pocket Galaxy - Luna became head of the astronomy department when her boss invented the Pocket Black Hole.
  • Stargazer Luna - She's Dr. Boom's right-hand mage.
  • Astromancer - All signs point to Antonidas.
  • Unexpected Results - Sometimes science is more art than science. A lot of people don’t get that.
  • Meteorologist - Some say the world will end in fire. Some say in ice. Why not BOTH?
  • Celestial Emissary - Casting with the stars.
  • Astral Rift - Let's see what's behind rift number one!
  • Research Project - Abstract: Analyzing systemic applications of coldlight data sets vis-a-vis shuffle-related paradigms. Conclusion: Yay, cards!
  • Shooting Star - Literally starstruck.

New Paladin Cards

  • Kangor's Endless Army - "That's three, Kangor. Three isn't endless." - Countess Ashmore
  • Crystalsmith Kangor - He wants to tank, but Boom always makes him play support.
  • Glowstone Technician - "Windell! More light!" "I'm givin' it all she's got, Kangor!"
  • Prismatic Lens - Mined exclusively from the dark side of the moon.
  • Shrink Ray - Actually works by enlarging the rest of the world.
  • Annoy-o-Module - Every ten seconds it asks if you want to update.
  • Crystology - "The Light is neither a particle nor a wave. It's more of a juice, really."
  • Mechano-Egg - When you need more iron in your diet.
  • Glow-Tron - They tried for weeks to make a stealth version, but eventually decided to just let it glow.
  • Autodefense Matrix - We call it the bubble machine.

New Priest Cards

New Rogue Cards

New Shaman Cards

New Warlock Cards

  • Dr. Morrigan - She will NOT STOP until she gets tenure.
  • The Soularium - Worst field trip ever.
  • Ectomancy - "Zerek! Stay out of my lab!"
  • Omega Agent - They don't just find the truth. They give it a ten second head start, then hunt it down.
  • Nethersoul Buster - Why did the demon cross the streams? To get to The Other Side.
  • Void Analyst - Conclusion: Nothing there.
  • Soul Infusion - People called him a soulless monster. We're not sure this is better.
  • Doubling Imp - What's worse than finding two imps in your lab? Only finding one of them.
  • Demonic Project - Another group project where Jaraxxus doesn't do any work.
  • Spirit Bomb - Might take a few episodes to power up.

New Warrior Cards

  • The Boomship - Dr. Boom ends his motivational speeches by dropping the mechs.
  • Beryllium Nullifier - Why Beryllium? Because it's hard to spell.
  • Supercollider - Boom's Second Law of Motion: HIT IT VERY HARD!
  • Security Rover - Insecurity detected. Alerting hugbots.
  • Dyn-o-matic - Star player on the inter-office Boomball team.
  • Omega Assembly - They told Dr. Boom he could only pick one. He disagreed.
  • Weapons Project - Harrison Jones was kicked off this project.
  • Rocket Boots - This is the happiest moment of Grik's life. We'll miss him.
  • Eternium Rover - He's all beeps and smiles but you're just a walking pile of armor to him.

New Neutral Cards

  • Mecha'thun - "Your software will fail. Your users will abandon you. You are already obsolete."
  • Zilliax - Everything but the kitchen sink. Oh wait, there's one on his back.
  • Subject 9 - The original clever girl.
  • Whizbang the Wonderful - From the prestigious Westfall Wonderfuls.
  • Harbinger Celestia - She wanders realities, taking on many forms. One was a unicorn princess.
  • Star Aligner - "You're a Sagittarius? Me too! Just gimme a sec."
  • Holomancer - Help me, worthy opponent. You're my only hope.
  • E.M.P. Operative - "I said this looks like a job for me So everybody just follow me 'Cause we need a little E.M.P. 'Cause it feels so mechy without me…"
  • Loose Specimen - You leave Deathstalker Rexxar alone in the lab for TWO minutes…
  • Seaforium Bomber - Dress for the bomb you want, not the bomb you have.
  • Weaponized Piñata - It'll be fine. It's not like they have any reason to hate us.
  • Omega Defender - "Surrender. You have 10 mana to comply."
  • Augmented Elekk - Her friends call her "Shuffleupugus".
  • Crystallizer - This elf's winning the arms race.
  • Arcane Dynamo - We ran out of jars, so we started putting brains in other stuff.
  • Mechanical Whelp - "Well if I didn't build the whelp and YOU didn't build the whelp…"
  • Missile Launcher - We asked, "Where do the missiles go?" and he answered, "Yes."
  • Giggling Inventor - "I shall build a mighty golden paladin! And he will GREET the WORLD!"
  • Spark Drill - Preferred weapon of Dr. Boom's orthodontist.
  • Replicating Menace - It's a car! *Whomp whomp whomp* It's a robot! *Whomp whom-CRUNCH* It's… three.. smaller robots!
  • Galvanizer - Also known as a power zinc.
  • Spark Engine - He goes by Bzzzzt Aldrin.
  • Unpowered Mauler - After a stressful work day it really needs an outlet.
  • Bull Dozer - Leave them alone for two minutes and they go right into sleep mode.
  • Damaged Stegotron - Sadly the warranty does not cover fireballs or acts of Boom.
  • Rusty Recycler - Ironic. It could recycle others, but not itself.
  • Wargear - WAR! GEAR! What is it good for?
  • Steel Rager - Rage alongside the machine.
  • Coppertail Imposter - It was fitting in fine until it gathered nuts <i>and</i> bolts.
  • Explodinator - When it absolutely, positively, has to blow up overnight.
  • Piloted Reaper - New facial recognition systems keep out the Lorewalkers and Doomsayers.
  • Bronze Gatekeeper - "You have my shield! And the rest of me too."
  • Spring Rocket - Proper grammar would be "sprung rocket."
  • Kaboom Bot - More Boom for your buck.
  • Brainstormer - Her hair was always like that.
  • Microtech Controller - Best-selling author of "How to Make Friends You Completely Control."
  • Electrowright - Carefully assembled from two Electrowrongs.
  • Toxicologist - Double-majoring in culinary sciences was definitely a mistake.
  • Whirliglider - She's on a bomb voyage.
  • Cloakscale Chemist - Her suit was fitted using a scale model.
  • Upgradeable Framebot - *Awesome arm not included.
  • Skaterbot - "See you later bot" - Jaina
  • Mecharoo - Its project name was KAN-GA. The little one was R-00.
  • Faithful Lumi - They're a little light-headed.
  • Goblin Bomb - They're Dr. Boom's babies. His baby boomers.

Official Patch Notes

Quote From Blizzard

This Hearthstone Update charges the nether coils as we get ready to pull the big, shiny lever that unleashes Hearthstone’s newest Expansion: The Boomsday Project, on August 7! This is also your chance to participate in cutting-edge research: drop by a special Fireside Gathering for a Pre-release Event where you can open The Boomsday Project packs and play with your new cards before the official release! This update also brings Arena updates, game mechanics updates, and a few card changes, as well as some bug fixes and feature improvements.


Read on for details.

The Boomsday Project!

The Boomsday Project is an electrifying expansion for Hearthstone featuring 135 all-new cards, starting August 7!

Harness the power of SCIENCE, including:

  • New Legendary Spells for all nine Classes!
  • New keyword: Magnetic! Combine Mechs into more powerful forms!
  • Omega cards that are ULTRA powerful when played at 10 Mana!
  • The Boomsday Project's free single player content, the Puzzle Lab, opens on August 21!
    • Over 100 challenging puzzles including Lethal, Board Clear, Mirror, and Survival puzzle types!


For a limited time after The Boomsday Project starts on August 7, log in to claim 3 card packs and a random Class Legendary minion (or Hero card)—both from the new expansion—for free!

Get 3 more The Boomsday Project card packs FREE when you log in after The Puzzle Lab launches starting August 21.

The Boomsday Project Pre-Release Event!

Attend a Fireside Gathering Pre-Release to open your packs from “The Boomsday Project”—and play with your new cards in a special Fireside Brawl—BEFORE the official launch of the Expansion! Learn more here!

Arena Updates

  • Offering rates for Class cards, including spells and weapons, have been reduced.
  • Rarity distribution adjusted.
  • This will result in Arena drafts having more neutral and common cards.

Be sure to read the Arena Developer Insights blog for details!

Game Mechanics Updates

Card Copying

Cards that create copies of other cards that are then added to different game zones have been made more consistent.


Whenever a card transforms it loses its enchantments.

Be sure to read the Developer Insights blog for details!

Card Changes

  • Shadowboxer now reads: Whenever a minion is healed, deal 1 damage to a random enemy.
    • Shadowboxer can be disenchanted for its full Arcane Dust value for two weeks.

  • The following Minions have changed Type:
  • Living Mana now reads: Transform your Mana Crystals into 2/2 Treants. Recover the mana when they die.


Days of the Frozen Throne

A chilly new celebration is coming!

  • New quests with huge rewards!
  • A free golden card!
  • A new Tavern Brawl celebrating the Death Knights!

Added the following card backs:

Dr. Boom's Lab



Bug Fixes and Gameplay Improvements

  • Added new “Return to Fireside” tooltip for Fireside Gatherings.
  • The Mac Client now uses Metal for graphics, where available.
  • New Daily Quest has been added for playing Mechs.
  • “Created By…” tags are no longer generated by the card’s last state before it died.
  • Deathaxe Punisher’s animation no longer plays without a valid target in hand.
  • Resolved effects and animation issues with Valeera the Hollow, [Hearthstone Card (Tess Greymane,) Not Found] and Shudderwock.
  • Zombeast cards have rarity gems, and no longer appear to be collectible cards.
  • Cards no longer display their yellow activation aura when their target can't be interacted with.
  • Card backs now properly show their cardback outline effect when played by opposing players.
  • Cards in hand no longer incorrectly overlap each other.
  • Chameleos will now transform and clear buffs when the opponent has only one card.
  • Chameleos will now copy stat buffs or cost reduction.
  • When Shifter Zerus transforms into a Worgen card, the next card it transforms into will no longer keep those stats.
  • Faceless Manipulator will now correctly advanced The Caverns Below quest.
  • Gnomish Experimenter no longer sometimes plays his transform animation twice.
  • Summoning Portal now properly updates cards that have had their mana cost set after it has been played.

Monster Hunt

  • Minions buffed by Sneak Attack it will now properly gain Charge if copied.

Developer Insights: 12.0 Game Mechanics Update

Quote From Blizzard

Dr. Boom’s bringing more than just mayhem to the Netherstorm. The 12.0 update will also come with several rule changes to Hearthstone’s gameplay. Read on to learn about another minion Type update, the copy a card rule change and the transform rule change.

More Minion Type Changes

There was a ton of feedback following the last minion Type update we posted, and after reviewing all of it, we realized that there were a couple more minions that needed changing. Here are our decisions following the full review of your feedback.

Ghostly Charger

We made a decision that, at least by default, spectral/undead/ghost/spirit versions of animals are not considered Beasts in Hearthstone. There are quite a lot of these sort of cards, most of which are already not Beasts, and changing them would have extensive balance implications.

Ghostly Charger is one of those cards. Clearly a ghost in both its name and art, its Beast tag has also not been relevant in any significantly used interaction. As a result, we’re planning to remove the Beast tag in a future update.

In the much rarer case of spectral/undead/ghost/spirit versions of Dragons, Murlocs, Pirates, and Elementals, they will still remain their Type. There aren’t a whole lot of these cards, but there are a few, and they’re already consistently their type. Examples of these are Ghost Light Angler, Cursed Castaway, Bone Drake.

Ixlid, Fungal Lord

World of Warcraft uses a looser definition of Elemental than what we decided to standardize on for Hearthstone. In Hearthstone, an elemental is something that has been brought to life by being inhabited by an elemental spirit, but is otherwise not alive. These are easy to recognize: a Fire Elemental looks like a living creature made out of fire; A Water Elemental looks like a living creature made out of water.

One of the biggest outliers to this definition are plant creatures. There are a ton of minions in Hearthstone that are some sort of plant. We’ve decided that these do not count as Elementals in Hearthstone. Examples of these include The Voraxx, Fen Creeper, Biteweed, Vilespine Slayer, Rotten Applebaum.

Ixlid, Fungal Lord, is by this definition, a plant creature. Although we’re committed to consistency, there are also other criteria that we consider when changing card Types. One of them is how often a card’s current Type matters when it comes to interacting with other cards. Ixlid’s Elemental tag is not significantly used in current decks, so we’ve decided to remove it in a future update.

We also looked at the following minions but decided against making any changes. We’ve included our thought process as to how we came to our decisions with these cards.

Kindly Grandmother

Kindly Grandmother/Big Bad Wolf looks like a Worgen (which are not considered Beasts) but is actually some other sort of wolf-like creature that is a Beast. The Beast tag is also extremely relevant to its gameplay, and defines most of the card’s intended usage. With this in mind, we will not be changing Kindly Grandmother’s/Big Bad Wolf’s Type. In the future, we’ll be more careful to make the art clear when it comes to Worgen or similar races.

Arcane Giant & Arcane Golem

On top of Elementals and plant creatures, there’s another category of things that have been brought to life via magical animation. These are creatures like War Golem, Arcane Giant, and Avian Watcher—which are not Elementals.

Arcane Giant, Arcane Golem, and The Curator are all examples of another sort of creature collectively referred to as Arcane Golems. These mechanical constructs utilize arcane energy as a power source, with The Curator being a Mech Type as part of his character in the One Night in Karazhan Adventure. This is actually subtly different from something like War Golem, which is carved from stone and then magically animated. While the “golem” definition refers to something that has been magically animated and is therefore neither a Mech nor Elemental, both Arcane Giant and Arcane Golem’s card art don’t clearly show them to be one or the other. Since the correct type for these creatures is so unclear, we will be leaving them unchanged for now, but would love to hear what you think.


Bogshaper seems to be the same type of creature as Ixlid or Fen Creeper, and that would logically lead to removal of its Elemental tag. However, as mentioned above, we look at more than just the fantasy of a card when determining if it needs a Type change. While Bogshaper’s fantasy criteria checkbox is filled, it’s currently heavily utilized in the meta, and features in many decks, including that of the 2018 Summer Champion, Bunnyhoppor.

We are holding off on changing Bogshaper’s Type for now, but would love to hear what the community thinks we should do in this case. We’re also considering making this sort of change when a card rotates to Wild.

Copy A Card Rule Change

Card copies currently only retain enchantments when both the original card and its copy are in play—think Molten Reflection. In Update 12.0, this rule will be updated to match the one regarding enchantments being retained when a card transitions zones.

Zones in Hearthstone are defined as areas where cards are hosted: your deck, your hand, in play, and in the graveyard. In Hearthstone, there is a general forward-moving flow through zones. Whenever a card moves forward in that flow (Deck -> Hand, Hand -> Play, Deck -> Play), it retains enchantments. If a card moves backwards in zones (Play -> Hand, Hand -> Deck, Play -> Deck, Play/Hand/Deck -> Graveyard and Graveyard -> Play/Hand/Deck), it loses enchantments.

With this update, card copies will retain enchantments in the following scenarios.

  • Cards that are resurrected currently do not and will continue not to retain any enchantments, unless specifically stated otherwise.
  • If you copy a card from a deck to a deck, the copy retains enchantments. (eg. Archbishop Benedictus)
  • If you copy a card from a hand to a hand, the copy retains enchantments. (eg. Mind Vision)
  • If you copy a card from play to play, the copy retains enchantments. (eg. Molten Reflection)
  • If you copy a card from a deck to a hand, the copy retains enchantments. (eg. Thoughtsteal)
  • If you copy a card from a deck to play, the copy retains enchantments. (eg. Mindgames)
  • If you copy a card from hand to play, the copy retains enchantments. (eg. Kobold Illusionist)

Transform Rule Change

When transformed, a Hearthstone card typically loses all of its enchantment. Most cards in game already obey this rule. However, there are four cards that we are changing to keep in line with the rule, as part of this consistency pass.

Shifter Zerus Card Image Molten Blade Card Image Shifting Scroll Card Image

Shifter Zerus, Molten Blade, and Shifting Scroll all transform in your hand at the start of every turn. Following the 12.0 update, they will no longer keep any enchantments when they transform. This includes things like hand buffs and Emperor Thaurissan mana-cost discounts.

Voodoo Doll Card Image

The impact on Voodoo Doll is a little different with the update. If you transform the minion that’s already been cursed by Voodoo Doll, the curse will be broken, and the transformed (and formerly cursed) minion will not be killed when Voodoo Doll dies. Silencing the cursed minion will also break the curse, in addition to silencing the Voodoo Doll.

Shadowboxer Update

Since the creation of the Lifesteal keyword, Shadowboxer has been a high risk card, in that it can trigger off of itself and deal up to 30 damage in one turn if you ever give it Lifesteal. Because of this, we have changed it to: Whenever a minion is healed, deal 1 damage to a random enemy.

Once Shadowboxer’s card change is live with Update 12.0, players will be able to disenchant it for its full Arcane Dust value for two weeks.

These are all the changes that you’ll see come into effect with Update 12.0, in line with our commitment to consistency within the game. Let us know what you think in the comments below, or via Facebook and Twitter!


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