Hearthpwn

Note: This deck is to make Master Oakheart good, rather than cubelock itself, and is just riding on the coattails of cubelock, making it just slightly viable.

This deck is just to use Master Oakheart to pull Possessed Lackey and Voidlord that are used in Cubelock, just as another way to start the combo. 

Tar Lurker and Darkshire Councilman are just for being pulled by Master Oakheart. Darkshire Councilman is surprisingly effective, since it gains 2 attack from being pulled by Master Oakheart and 3 more after Voidlord dies and with the taunts up, unless removed, will make it really hard to kill and could just snowball.

Dirty Rat is the other 2 attack minion pulled from Master Oakheart, making it just a good taunt body and also as an opportunity to break combo pieces if used from hand.

Rin, the First Disciple is the other 3 attack minion pulled from Master Oakheart. This is just another good body, with more value if you succeed in getting Azari, and can also be brought back by N'zoth, the Corrupter. 

Rest of the cards are just Cubelock cards. Dark Pact destroys any cubes. Carnivorous Cube can gain more value, destroying Voidlords or Doomguard. Skull of the Man'ari can summon any Demons that are stuck in your hand. Bloodleaver Gul'dan and N'zoth can summon back Voidlords. 
The rest of the cards are to board clear and regain health.