Mystic Veil is a common Enchantment — Aura card from Visions (VIS), collector number 38. Current market price: $0.11, TCGplayer market prices via Scryfall.
You may cast this spell as though it had flash. If you cast it any time a sorcery couldn't have been cast, the controller of the permanent it becomes sacrifices it at the beginning of the next cleanup step. Enchant creature Enchanted creature has shroud. (It can't be the target of spells or abilities.)