The Keeper of Kaldra is a rare Legendary Creature — Human Warrior card from Unknown Event (UNK), collector number RZ03c. Current market price: $19.99, TCGplayer market prices via Scryfall.
When The Keeper of Kaldra enters the battlefield, if it's the first time this ability has resolved this game, add Helm of Kaldra, Shield of Kaldra, and Sword of Kaldra as your companions. (You can pay {3} to put one into your hand from outside the game, once each. Use tokens to represent those cards.) Creatures you control named Kaldra have hexproof.