Hearthpwn

You can get a crazy winstreaks with this deck. It only loses to a perfect opening from your opponent and you get combo pieces in your hand (Worgen, Faceless, Charge) or it loses to a warrior with a bunch of armor. In the other cases it's favourable against everything.

Strategy: Draw bunch of cards, kill your opponent with combo or swarm the board with patrons and get a tons of armor.

It has a very creative board clear: Wild Pyromancer + Commanding Shout + a few cheap spells. You can combine it with acolyte to get a full value of it, or fill the board with patrons in one turn.

The main finisher: Raging Worgen + Charge + Inner Rage + Faceless Manipulator = 32 damage for 11 mana (With Emperor Thaurissan you need to hit at least 1 card to play out the combo, expect Inner Rage).

Mulligan:
ALWAYS keep Fiery War Axe no matter what. With it you can keep Slam, Armorsmith, Blood To Ichor, Ravaging Ghoul, Acolyte of Pain. Sometimes you can keep Whirlwind, Wild Pyromancer, Shield Block, or Execute (if you know you up against control). Keep Inner Rage if you have Axe and Acolyte.
NEVER KEEP: Raging Worgen, Faceless Manipulator, Charge, Emperor Thaurissan, Grim Patron, Commanding Shout, Battle Rage.

Try to get at least 2 cards from Acolyte and Battle Rage. Calculate an ideal turn for board swing. Never play Emperor if you don't have combo parts (Worgen, Charge, Faceless).