Gideon's Intervention is a rare Enchantment card from Amonkhet Promos (PAKH), collector number 15s. Current market price: — (foil $0.60), TCGplayer market prices via Scryfall.
As this enchantment enters, choose a card name. Your opponents can't cast spells with the chosen name. Prevent all damage that would be dealt to you and permanents you control by sources with the chosen name.