Hearthpwn

Next: A Scourged themed spell that is anti-aggro for warlock it can't be traditional AoE though, Damage all enemies/enemy minions for example.

It would become Kel'thuzads laugh! Now SPAM IT INTERLOPER!

Next: Use this image! 

With the way auto attack works depending how many minions are on the field he'll either do 4 damage or 8. If there's two minions infront he hits both those minions adjacent minions, whereas if there is one directly infront of him it will only hit two.

Next: Some flavorful Card Draw for hunter.

It was Livienna!

Next: A niche card for Hunter that isn't Trap or Beast based.

Next: A Death knight minion (not legendary!) for paladin.

Next: A card that would make Brass Knuckles viable.

Next: A card that does something the turn after it's played.

Next: A legendary Draenei minion for a Non-Divine (Priest, Paladin, Shaman, Druid.) class.

"Notably better than his Sister Calia, The Silver Bishop."

Triggers on anything with "Silver Hand" in it's name!

Next: Continue this theme.

Token/Bolster warrior! wooooo

Next: More things for Taunt warrior, buffs, supporting minions, whatever you want!

Next: A Card based on 2 different world of warcraft Professions.

Next: A Fel Orc minion for warlock and warrior.

Secret Synergy for all the mage specs!

Next: Hunter secret synergy for each spec!

Forces your opponent to clear the board asap or deal with a bunch of little explosions preventing small minions. You need a minion or two on the board to get the effect to trigger, it does copy the effect before dealing damage so that it will spread if it kills an enemy minion.

Next: A Chaos Bolt spell for warlock, but make it unsual not just "deal x amount of damage".

"To bad it can't reload itself!"

It'd have an animation where it shoots gears and stuff (spare parts!)

Next: Another gimmicky card.

Obvious spare part synergy, the idea was whenever you played a spart