Katara, Waterbending Master is a mythic Legendary Creature — Human Warrior Ally card from Avatar: The Last Airbender Eternal (TLE), collector number 93. Current market price: $7.94 (foil $9.33), TCGplayer market prices via Scryfall.
Whenever you cast a spell during an opponent's turn, you get an experience counter. Whenever Katara attacks, you may draw a card for each experience counter you have. If you do, discard a card.