Yue, the Moon Spirit (TLA)

Legendary Creature — Spirit Ally

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}.)

Reliable flyer and mana sink for blue control and tempo decks. Yue offers evasive pressure while its waterbend ability provides late-game card advantage by casting spells for free—though the five-mana activation cost and tap requirement mean it's best in decks with excess mana and artifacts to fuel the ability. Solid in Commander and Pioneer control shells where you can untap it or generate value from the tapped artifacts.

Avatar: The Last Airbender — Rare