Sokka, Bold Boomeranger is a rare Legendary Creature — Human Warrior Ally card from Avatar: The Last Airbender (TLA), collector number 240. Current market price: $0.30 (foil $0.33), TCGplayer market prices via Scryfall.
When Sokka enters, discard up to two cards, then draw that many cards. Whenever you cast an artifact or Lesson spell, put a +1/+1 counter on Sokka.