Equarian War Beast

Mutate {2}{w}{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.)
Whenever this creature mutates, create and
attach a white aura enchantment token named
Armor with "If enchanted creature would be
destroyed, instead remove all damage from it
and destroy this Aura."