Control the game until you get Mech’thun in hand, play 2x Galvanizers at any point while Mech’thun is in hand. After drawing your final card, play Mech’thun into Bloodbloom into Cataclysm to destroy the board and discard your hand, might not work due to the wording of Cataclysm, but if I pull it, I will try it!