You may cast Mystic Veil 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.
Enchanted creature has shroud. (It can't be the target of spells or abilities.)
8/1/2005 Does not destroy Auras which are already on the creature.
10/1/2009 The sacrifice occurs only if you cast it using its own ability. If you cast it using some other effect (for instance, if it gained flash from Vedalken Orrery), then it won’t be sacrificed.