Warlock
Combo-Control Warlock deck based on drawing your whole deck and reducing to 8 the cost of Mecha'thun with 2 Galvanizers, then play it alongside Bloodbloom plus Cataclysm to win the game. Defile, Doomsayer and Lesser Amethyst Spellstone help you stay alive in the early and mid game.
Why spirit bomb?
It’s a flex spot to fight aggro, like Zoo. When they play Keleseth turn 2 a lot of their minions become high health, and this should deal with them or help to kill them with Defile or Hellfire. It could be the 2nd Vulgar Homunculous.