Mulligans
The combo is to draw your entire deck then play double Galvanizer. The following turn play Mecha'thun followed by Bloodbloom followed up by Cataclysm. Besides that, this plays like a regular even warlock, which is a tier 1 deck. Giving a tier 1 deck an instant win condition is extremely powerful so I’m interested to see how this will turn out.
I have practiced this deck over the past day and you will not get the combo off before you die. You can’t mill that much on your hero power alone.