Appa, Steadfast Guardian - Avatar: The Last Airbender #10

Appa, Steadfast Guardian

Set: Avatar: The Last Airbender (TLA)
Collector Number: 10
Type: Legendary Creature — Bison Ally
Rarity: Mythic
Mana Value: 4.0

Flash
Flying
When Appa enters, airbend any number of other target nonland permanents you control. (Exile them. While each one is exiled, its owner may cast it for {2} rather than its mana cost.)
Whenever you cast a spell from exile, create a 1/1 white Ally creature token.