Sokka, Bold Boomeranger is a rare Legendary Creature — Human Warrior Ally card from Avatar: The Last Airbender Promos (PTLA), collector number 240s. Current market price: — (foil $10.10), 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.