Luvox, Apex of Thoughts

Mutate {4}{w/b}{u}{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.)
Islandwalk, menace, vigilance
Whenever this creature mutates, you may
discard your hand. If you do, you gain 1 life for
each card discarded this way and draw seven
cards.