Goan,the Eldritch lich

Deathtouch.
Mutate{5}{u/b}{u/b}(if you cast this spell for it's mutate
cost, put it on top or bottom of target non-human Creature you own. They
mutate into the creature on top plus all
abilities from under it.)
When this creature mutates return target creature
from a Graveyard to your side of the field.
Exile it at the beginning of the next endstep.