Hearthpwn

It's a control deck, the idea is to always have more (small) minions than your opponent.

Has a lot of healing options as you are going to abuse the hero power (not to mention the damage you're going to take by the Flame Imp). Sacrificial Pact is meant to be used in the imps generated by Impbalming.

Leeroy Jenkins and Ragnaros are meant to be finishers rather than controlling options.

Disclaimer: This is a very cheap deck that I'm currently testing in low ranks. I want to make it public because I think the performance of this deck may be improved with better cards.