Knull, God of Mutations

Eminence - While this card is on the battlefield
or in the command zone, when a card Mutates
you may add 1 card that contains a effect that
mentions "Mutate" that is of a converted mana
cost up to 2 higher than the Mutates cost.
Indestructible, Undying
This card may only be cast from the Command
Zone for it's Mutate cost.
Mutate {w}{u}{b}{r}{g}: Whenever this creature
Mutates, all Mutate effects that would activate
trigger twice instead.