Aang, Passive Revolutionary

Flying, Hexproof
Whenever Aang deals damage to a player, exile a creature they control.
At the beginning of your upkeep, you may
pay {w}{w}. If you do, put a creature exiled by
Aang into play under your control.
Aang gains +5/+5 and indestructible as
long as you control a creature of each color