The Hearthstone community manager on Reddit says it wasn't meant to be out yet, and it'll be on sale soon:

Quote From Kaeyoh

Hey everyone, the Cupcake Card Back was not intended to be available during that time. However, we do have plans to make this available through the Shop, as we did with the Naxxramas Card Back, in the near future. Stay Tuned!

https://www.reddit.com/r/hearthstone/comments/ie1i1a/hearthstones_cupcake_card_back_returns_but_not/g2e24dq?utm_source=share&utm_medium=web2x&context=3

FWIW I had an active run yesterday and as of now, 4:15 PM PDT June 6, the run is still active (they didn’t retire me and give me a ticket). Is Scholo available in Arena drafts today? I only have one loss, I’ll probably play to a second loss tonight and see if I see Scholo cards played against me..

Hm, potential synergy with Lorekeeper Polkelt? Polkelt would sort all your soul fragments to the bottom, keeping them safe for your other cards that need them. You just have to be careful not to create any more soul fragments, since they'd get shuffled into the deck, ruining that nice order Polkelt gave you.

Well, the phrasing is confusing. It isn't "references to real-world schools" (and, in any event, "Transfer Student" isn't going to a real-world school, he's going to Scholomance!). It's "real-world reference to schools". That could mean "reference in the real-world (by devs or in card flavor text?) to magic schools that aren't ordinarily referred to explicitly". Or something else? Like I said, it's vague! (And "all too relatable" was no help. I thought maybe "schools" meant something like "tribes", families of minions that don't have an official label? Since they're "related"?)

I'd rephrase as just "References to schools, universities, and so on." And maybe change the bingo square's name to "Back to School"?

Ah — “school“ as in places people go to learn things? Not as in “schools of magic“ (arcane vs el vs ...) or something? That’s what was confusing me.

more broadly, a lot of those definitions could use more explanation. As it is, a lot of them are very obscure if you don’t know the in-joke.

Dumb question, what does the definition of "All too relatable" mean? ("real word reference to schools")

I suppose it could be handy in some of the solo adventures, since you’d know what board it would be playing on? 

Quote From Fluxflashor

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Quote From Anathemos

My collection got messed up again. It looks like whenever I do a JSON import, it's highly likely to add the cards in my collection, instead of replacing my current collection with the results of the import. The result is, if I had a single copy of an epic card in my collection, then when I do the JSON import, it inaccurately shows me as having two copies of that card.

Is this a known issue? Should I make a separate report?

Yes, that is how it works, it ADDS all the cards from JSON import, you need to import only once and then manually change your collection on the site with any future changes. We know, its pretty bad, but thats how it works for now. We are working on a better implementation.

I just want to clear things up. This was never the intention of the feature. Bulk importing is supposed to calculate card differences but there's some funky logic that isn't up to par. Better implementation of it all is the end goal.

Understood! I wonder—would a “wipe my collection” button be easier to implement? Since I’m only doing full-collection imports, I’d be happy to wipe before each import if that were available.

Thanks much!

My collection got messed up again. It looks like whenever I do a JSON import, it's highly likely to add the cards in my collection, instead of replacing my current collection with the results of the import. The result is, if I had a single copy of an epic card in my collection, then when I do the JSON import, it inaccurately shows me as having two copies of that card.

Is this a known issue? Should I make a separate report?

Hey all! I love the "dust cost to me" feature on deck pages. But right now, I don't see "cost to me" on the deck summary that's shown on pages that list a bunch of decks (like the "weekend wild decks" page). That means I see five decks that look fun, but I have to click through on each deck to see whether I can build it. Could you add the "cost to me" into the deck summary? Thanks!

Hey all! Somehow my card collection on OutOfCards got corrupted again (it's incorrectly saying I have two or three of some cards that I'm missing). Can I ask to have my collection wiped? Then I can re-import from JSON and have it right.

(Associated feature request--maybe offer a button to let us wipe our collection ourselves?)

Thanks much!

Just tried it a few times (I’m not much for wild but I had these cards), and so far it’s crazy-go-nuts! Let’s see how far I can ride this, I’d like more wins on my Druid 

Thanks, this did it for me! Was able to put a buffed Reliquary of Souls down while Illy was topdecking, and that was the end of it.

Thanks! This worked for me on the first try.

FWIW, I used this deck to beat the first couple of bosses in the Outland "Trial by Felfire" challenges, did it on the first try for each of them. Might not be so good against all the bosses, but "hold out until you've finished the quest, then go crazy" seems pretty solid. (I used a Year of the Dragon Quest Rez Priest deck for almost all the heroic Galakrond's Awakening bosses.)

Went with Mage and it was pretty easy.  Other player banned Sorcerer's Apprentice but by turn 8 I was going to town. May try again with Demon Hunter just for the XP..

...achievement? I think this is the first achievement in the game! I know they were planned for later in the year..

So once again my collection got out of sync (there are a bunch of epic cards which I only have one of but OutOfCards thinks I have two).

A suggestion--when I do a full JSON Import, maybe have the option of saying "Wipe my old collection and set it to only what's in this JSON"? Or just have a "clear my collection" button?

Thanks much!

Worked for me on the second try, thanks!

Thanks much!