Beaked Whaleshrimp

Mutate {3}{u} (If you cast this spell for its mutate cost,
put it over or under target non-Human creature you
own. They mutate into the creature on top plus all abilities from under it.)
When Beaked Whaleshrimp enters the battlefield, return target non land permanent you
don't control to its owner's hand.
Whenever this creature mutates,
put a +1/+1 counter on it.