Suki, Courageous Rescuer is a rare Legendary Creature — Human Warrior Ally card from Avatar: The Last Airbender (TLA), collector number 37. Current market price: $0.27 (foil $0.38), TCGplayer market prices via Scryfall.
Other creatures you control get +1/+0. Whenever another permanent you control leaves the battlefield during your turn, create a 1/1 white Ally creature token. This ability triggers only once each turn.