Mulligans
The goal is to get Malchezaar’s Imp and Cataclysm in the first few turns. Ideally play the Imp then play Catalcysm with six remaining cards in your hand (eight including those two), to discard six, draw six, and activate quest. Alexstrasza and Jaraxxus are helpful to jump your health back to fifteen because you often take a lot of damage early game because you’re hero tapping frequently and passing turns. If you don’t have the Imp, just play Cataclysm anyways because it’s good to activate the quest and clear the board then to wait it out.