Hearthpwn

This is a control warlock deck that focuses on buffing minions (specially demons) while they still in your hand and use their improved stats to pressure the opponent in the late game. As such, it uses cards like Soul Infusion, Void Analyst (for your demons) and Arena Fanatic to improve your other minions before you play them. Best candidates for the buffs are Omega Agent and Hir'eek, the Bat.

I was testing this idea yesterday because i needed to find some use for my legendary loa, Hir'eek, the Bat, which i thought was completely hopeless upon reveal (and i was even more disappointed when i received it upon login).

I wouldn't call him hopeless but it is far from viable in ladder right now. It is fun to play with and experiment and can work both as a standalone win condition (when buffed and played at the right time) or just as a way to force your opponent to use their removals so that you can use Bloodreaver Gul'dan's battlecry more effectively. 

This isn't a deck for the ladder. It's just something to have fun with so don't expect anything if you try to climb the ranks with it. Do it at your own risk. I hope you have fun with it!