Cho-Manno's Blessing is a common Enchantment — Aura card from Mercadian Masques (MMQ), collector number 12. Current market price: $0.37 (foil $8.25), TCGplayer market prices via Scryfall.
Flash Enchant creature As this Aura enters, choose a color. Enchanted creature has protection from the chosen color. This effect doesn't remove this Aura.