Hearthpwn

This deck is primarily focused on controlling the board in the early game with cards such as spirit claws, storm crack, lighting bolt, and totem golem. If you find yourself falling behind you can swing the game with lightning storm (and spell power). Ragnaros is there for the slower match-ups and could be replaced with Al-Akir. If all else fails, you can get the guaranteed win with Yogg. 

Mulligan:

You always keep Tunnel Trogg and Totem Golem. Against aggro lightning bolt and stormcrack are good. Spirit claws is also a potential keep (especially if you have thalnos). If you're on the coin consider keeping a 3 drop depending on the quality of the rest of your hand.