Majestic Auricorn
From Ikoria: Lair of Behemoths set
Majestic Auricorn
Creature — Unicorn
4/4
Mutate
(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.)
Vigilance
Whenever this creature mutates, you gain 4 life.