Maha, Its Feathers Night + Crovax, Ascendant Hero

Maha, Its Feathers Night

Crovax, Ascendant Hero

How it works

1. All nonwhite creatures your opponents control will have base toughness 0, and die as a state-based action due to having 0 toughness unless there is another effect increasing its toughness.
2. Whenever a nonwhite creature enters the battlefield under an opponent's control, it will have base toughness 0, and die as a state-based action due to having 0 toughness unless there is another effect increasing its toughness.