A Girl and Her Dogs

When Aang enters, airbend another target creature. (Exile it. While it's exiled, its owner may cast it for 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.

When Rinoa Heartilly enters, create Angelo, a legendary 1/1 green and white Dog creature token.

Angelo Cannon — Whenever Rinoa Heartilly attacks, another target creature you control gets +1/+1 until end of turn for each creature you control.

Whenever another creature you control attacks, it gets +0/+1 until end of turn.

Flying

When this creature enters, return two creatures you control to their owner's hand.

Whenever this creature or another creature is returned to your hand from the battlefield, create a 1/1 white Soldier creature token.

When Abdel Adrian enters, exile any number of other nonland permanents you control until Abdel Adrian leaves the battlefield. Create a 1/1 white Soldier creature token for each permanent exiled this way.

Choose a Background (You can have a Background as a second commander.)

Flying

Whenever Gwaihir attacks, target attacking creature gains flying until end of turn.

At the beginning of each end step, if you gained 3 or more life this turn, create a 3/3 white Bird creature token with flying and "Whenever this token attacks, target attacking creature gains flying until end of turn."