Hearthpwn

I found the best start would be:

1 - Flame Imp, 2 - Demonfire

Defile, Bane of Doom, Hellfire, Shadow Bolt and Shadowflame for control

If in desperation I would recommend buffing a minion then using Shadowflame to wipe your opponents board if it means your survival   

Dread Infernal is good for weaker minion clearing or just chipping away at bigger minions health

Dark Pact would ideally be used late game in dire a situation, another great combo is using it on Lord Jaraxxus Infernals (3 mana, heal 8)

Sense Demons helps early game to draw out Lord Jaraxxus or any other minions which will be helpful

You may decide to swap some of the control cards for more demons or helpful minions

Please comment with experiences of using the deck!