Katara, Heroic Healer is a uncommon Legendary Creature — Human Warrior Ally card from Avatar: The Last Airbender Eternal (TLE), collector number 269. Current market price: $0.59, TCGplayer market prices via Scryfall.
Lifelink (Damage dealt by this creature also causes you to gain that much life.) When Katara enters, put a +1/+1 counter on each other creature you control.