Zlareap, Apex of Dominance

Mutate-{3}{u/b}{u/r}{b/r} (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 this creature mutates, gain control of
target creature an opponent controls, you may
mutate that creature onto this creature without
paying its mutate cost, this creature loses this
ability until end of turn.