The Fear Of The Sea

Mutate {5}{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.)
Blue creatures can't block it.
Whenever this creature mutate, put an opponent target creature from the battlefield to his hands.
When The Fear Of The Sea dies, create X 1/1
Marine Chumpus token where X is the number
of mutations on the creature