The Oozolith, Unleashed

Mutate {w/u}{u/b}{b/r}{r/g}{g/w} (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.)
The Oozolith has all abilities of each creature
with mutate.
All creatures you control with mutate are
Mutant in addition to their other types.