Cait, Cage Brawler is a rare Legendary Creature — Human Warrior card from Fallout (PIP), collector number 409. Current market price: $0.45 (foil $0.47), TCGplayer market prices via Scryfall.
During your turn, Cait has indestructible. Whenever Cait attacks, you and defending player each draw a card, then discard a card. Put two +1/+1 counters on Cait if you discarded the card with the greatest mana value among those cards or tied for greatest.