Cradle of Safety is a common Enchantment — Aura card from Innistrad: Crimson Vow (VOW), collector number 54. Current market price: $0.27 (foil $0.26), TCGplayer market prices via Scryfall.
Flash 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.