Hearthpwn

This is really good.  Doesn't have to be played as a combo.  It's on curve stats even though it has an undesirable 1 attack, which helps it live if played on curve.  Then you get a value bomb.

For 10 Mana, it can cast Natural Selection, Pyroblast, Puzzlebox of Yogg-Saron,  Nagrand Slam, or Dimensional RIpper.

For 9 mana, I can think of Mass Resurrection or Plague of Death

For 8 Mana, I know there is Deep Freeze, Power of Creation, Twisting Nether, Inner Demon, Gift of the Wild.

You do realise there are spells it in this expansion also? you should add those too.

Soul Mirror will proc either Overflow and heal anything left alive or it just kills the board with Earthquake or another Soul Mirror....it's almost like a an Ultimate Infestation if it procs right....minion+heal+card draw+minion damage

Yogg'Saron must be pleased!!!

I cant tell which "Pot of Greed" card fits the artwork better, Pot of Riches or Pot of Avarice.

Mixture of both I can see

It isn't Hearthstone if there's at least a card with the word "random" on it. They can't giving up praising Yogg. 

Pot of Greed 

That artwork makes me feel like this card can allow me to draw two cards from my deck and them directly to my hand.

Only if you shuffle 5 deceased minions into your deck beforehand.