Aang, the Last Airbender (#4)

Type: Legendary Creature — Human Avatar Ally

Text: Flying
When Aang enters, airbend up to one other target nonland permanent. (Exile it. While it's exiled, its owner may cast it for {2} rather than its mana cost.)
Whenever you cast a Lesson spell, Aang gains lifelink until end of turn.

Set: Avatar: The Last Airbender (#4)