Runed Halo is a rare Enchantment card from Core Set 2021 (M21), collector number 346. Current market price: $0.40 (foil $0.50), TCGplayer market prices via Scryfall.
As this enchantment enters, choose a card name. You have protection from the chosen card name. (You can't be targeted, dealt damage, or enchanted by anything with that name.)