Appa, Steadfast Guardian
From Avatar: The Last Airbender set
Appa, Steadfast Guardian
Legendary Creature — Bison Ally
3/4
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 rather than its mana cost.)
Whenever you cast a spell from exile, create a 1/1 white Ally creature token.