Gabriel, Purity of Void

Eminence — As long as Gabriel, Purity of Void is in the command zone or on the battlefield you may spend {c} as though it were mana of any color for Eldrazi and Artifact spells and those spells have colorless color identity.
Indestructible
Bleaching 4 (When this spell is cast or attacks, four target permanents gain devoid)
If an opponent controls no colored permanents, they lose the game.