Appa, Loyal Sky Bison (Avatar: The Last Airbender)

Legendary Creature — Bison Ally - Flying
Whenever Appa enters or attacks, choose one —
• Target creature you control gains flying until end of turn.
• Airbend another target nonland permanent you control. (Exile it. While it's exiled, its owner may cast it for {2} rather than its mana cost.)