Kenjaku, The World's Evil

When Kenjaku, The World's Evil enters the battlefield, you may choose a creature your opponents control and Mutate with them.
When Kenjaku, The World's Evil gets into the command area, you may choose to lose or keep the Mutation.
If you choose to lose a Mutation, you can cast Kenjaku, The World's Evil from the command zone for {2}{b}{r}{g}