Aang, Airbending Master 74 (Avatar: The Last Airbender: Eternal-Legal)

When Aang enters, airbend another target creature. (Exile it. While it's exiled, its owner may cast it for {2} rather than its mana cost.) Whenever one or more creatures you control leave the battlefield without dying, you get an experience counter. At the beginning of your upkeep, create a 1/1 white Ally creature token for each experience counter you have.

NM - $15.28
LP - $12.22
MP - $8.73
HP - $5.82
DMG - $2.91