Shield of Kaldra is a rare Legendary Artifact — Equipment card from Darksteel (DST), collector number 139. Current market price: $8.76 (foil $19.00), TCGplayer market prices via Scryfall.
Equipment named Sword of Kaldra, Shield of Kaldra, and Helm of Kaldra have indestructible. Equipped creature has indestructible. (Damage and effects that say "destroy" don't destroy it.) Equip {4}