Hearthpwn

The first idea was to made an agro deck that use enrage mechanic, but now it more midrange type. The main idea is to use enrage enablers within strong enrage minions, that makes this deck good against aggro, because we have some "Whirlwind" type cards, that clear the board and enable our enrage as well.

Enrage activators: 
Overlord's Whip  - powerfull card in this deck. keep it on 1 durability until you can switch it
Blood Razor - "Whirlwind" + weapon  = excelent
Scourgelord Garrosh - more "Whirlwind"

Enrage combo: 
Dozing Marksman - 4/3 for 2 mana
Spellzerker - Mortal Strike at 8 each to the face
Battle Rage - good draw
Acolyte of Pain - always draw 1 card
Frothing Berserker - always big, you almost win if one time it hits the face
Val'kyr Soulclaimer  - 1/3 + 2/2 almost all the times + potential 2/2 next turn
Gurubashi Berserker - big minion 5/6 that you can buff easily
Spiteful Smith - 2/4 weapon becomes 4/4 - pretty good
Security Rover - 2/4 + 2/3 taunt, then one or two 2/3 plus to it
Grommash Hellscream - 10 damage finisher

Other cards:
Omega Assembly - use to get early minion or 3 in the lategame
Execute - best removal
Mortal Strike - combo with Spellzerker

Mulligan:
Overlord's Whip 
Dozing Marksman
Val'kyr Soulclaimer
Frothing Berserker

Replacments: 
Rotface - good late card
Animated Berserker - damage your minions twice
Redband Wasp - early game card
Sudden Genesis - just copy your board
Loose Specimen - i don't know, lets try this )))
Raging Worgen - who knows, who knows...