Appa, the Vigilant is a rare Legendary Creature — Bison Ally card from Avatar: The Last Airbender Eternal (TLE), collector number 62. Current market price: $4.25 (foil $4.48), TCGplayer market prices via Scryfall.
Flying, vigilance Whenever Appa or another Ally you control enters, creatures you control get +1/+1 and gain flying and vigilance until end of turn.