Starlit Mantle is a common Enchantment — Aura card from Theros Beyond Death (THB), collector number 67. Current market price: $0.09 (foil $0.27), TCGplayer market prices via Scryfall.
Flash (You may cast this spell any time you could cast an instant.) Enchant creature you control When this Aura enters, enchanted creature gains hexproof until end of turn. (It can't be the target of spells or abilities your opponents control.) Enchanted creature gets +1/+1.