This Mecha'thun Warlock deck has almost only cards at 3 mana or below, then you can play the combo quite fast because of Hemet. The deck doesnt have Cataclysm, so you have to play everything in hand, instead of discarding them.
The idea is to draw Pleague of flames and Galvanizer before throwing Hemet, so you can make that Mecha'thun combo at the end.
If you have an idea that might improve the deck. please share it in the comments. Good luck :)