Yue, the Moon Spirit is a rare Legendary Creature — Spirit Ally card from Avatar: The Last Airbender (TLA), collector number 338. Current market price: $1.38 (foil $1.60), TCGplayer market prices via Scryfall.
Flying, vigilance Waterbend {5}, {T}: You may cast a noncreature spell from your hand without paying its mana cost. (While paying a waterbend cost, you can tap your artifacts and creatures to help. Each one pays for {1}.)