Otrimi, the Ever-Playful is a mythic Legendary Creature — Nightmare Beast card from Commander 2020 (C20), collector number 12. Current market price: $1.12 (foil $1.06), TCGplayer market prices via Scryfall.
Mutate {1}{B}{G}{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.) Trample Whenever this creature deals combat damage to a player, return target creature card with mutate from your graveyard to your hand.