Celestial Armor is a rare Artifact — Equipment card from Foundations (FDN), collector number 5. Current market price: $0.40 (foil $0.70), TCGplayer market prices via Scryfall.
Flash (You may cast this spell any time you could cast an instant.) When this Equipment enters, attach it to target creature you control. That creature gains hexproof and indestructible until end of turn. Equipped creature gets +2/+0 and has flying. Equip {3}{W} ({3}{W}: Attach to target creature you control. Equip only as a sorcery.)