Mulligans
General Mulligans
Cult Master can keep if you have Firefly &/or Alleycat, for extra draw.
Start with the quest, play as many 1 drops as possible.
Use Cult Master if you have enough worthless 1 drops lying around by turn 4 to refuel.
Hold Tundra Rhino until you can spam the Brood.
Coldlight Oracle and Tol’Vir Warden to help with card draw in mid-late game.