Helm of Kaldra is a rare Legendary Artifact — Equipment card from The List (PLST), collector number 5DN-131. Current market price: $4.40, TCGplayer market prices via Scryfall.
Equipped creature has first strike, trample, and haste. {1}: If you control Equipment named Helm of Kaldra, Sword of Kaldra, and Shield of Kaldra, create Kaldra, a legendary 4/4 colorless Avatar creature token. Attach those Equipment to it. Equip {2}