This deck tries to be C'Thun and taunt warrior at the same time and ends up being inconsistent because of it. You should have one clear idea when you build a deck. Having too many different cards with too many purposes just makes your deck slow compared to decks with single idea. Against pure C'Thun the pure C'Thun kills you first with bigger C'Thun and taunt warrior completes quest quicker and kills you with Sulfuras hero power. Go for full taunt warrior or full C'Thun warrior or don't go at all.