Mecha'thun First Draw:
maybe Corrupting Mist
Then play Hemet, Jungle Hunter , your deck is much smaller now! just draw the rest of it. after you drawn Mecha'thun play 2 Galvanizer and when its only down to 1 card Remove your minions in battlefield or just Play Corrupting Mist
next turn you are ready to go! play 8 mana Mecha'thun then Bloodbloom and after that Cataclysm ! your hand is empty ! board is dead and your deck is filled with nothing. EZ win EZ Clap