Karriz, Praetor of Evolution

Non-human, non-legendary creature spells you
cast have mutate. Their mutate cost is equal to
their mana cost. when you cast a creature spell in
this way it may only target Karriz, Praetor of Evolution and you may only put it under Karriz.
If Karriz, Praetor of Evolution would die, you
may instead put a mutated creature card under it
into its owners graveyard. If you do remove all
damage marked on it.