Brightwing

Ahh brightwing, the lovable fae dragon that used to be the big shot, now is mostly unused, here are my ideas for buffs.

1. Brightwing's Necklace should give at least +3 more health.

2. Pixie's Pouch should have been "Pixie Dust restores 4 less health but has no cooldown"

Illidan Stormrage

"You are not prepaired!" yeah, although I thought about your buffs in advance.

1. Blade Dance should be 4 random enemies.

2. All of his abilities are now Fel.

3. Winged Assault gives +3 attack.

Uther Lightbringer

Imagine dying, cringe

1. Libram of Sacrifice is now a Battlecry but only gives it to your Humans.

2. Blessing of Protection restores 2 more health.

Thrall

SMorc

1. For The Horde is now 5 speed, so you can now upgrade Mak'Gora.

2. Ornate Warhorn deals 7 more damage.

3. Warchief's Command does your right most minion instead. (So summons can work better, not really a buff)

That's all folks, I tried to choose mercs that most other people don't cover, and also the ones I personally think are cool.