Mulligans
Mostly a deck to counter Quest Priest, a bunch of transforms and removal. And you don’t have to deal any damage to them, because you blow them up with Mecha’thun. Just survive, clear the boards, draw and eventually, discount Mecha’thun to (8) mana and lightning bolt 2x + zap x2 for 10 damage to your mecha’thun.
7 cards Mecha’thun combo, no thank you.
Zap x2, Lightning Bolt x2, Galvanizer x2 and Mecha’thun. Probably less than 30% winrate and not fun a lot.