Dreamtail Heron is a common Creature — Elemental Bird card from Ikoria: Lair of Behemoths (IKO), collector number 284. Current market price: $0.18 (foil $0.34), TCGplayer market prices via Scryfall.
Mutate {3}{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.) Flying Whenever this creature mutates, draw a card.