This is just a normal even handlock with Mecha’thun package sprinkled on top to draw the combo faster, the combo goes as followed:
Play Galvanizerx2 when you draw Mecha'thun to discount it by 2. When your deck has run out of cards play Mecha'thun for 8 mana, Bloodbloom into Cataclysm which will discard your hand and kill Mecha’thun and any other minion on board meeting the requirement for the Mecha’thun deathrattle.


















also if you want you can swap lich king for hemet to fatigue your deck faster