Obscuring Aether
Dragons of Tarkir — rare
Enchantment
Obscuring Aether rulings:
2015-02-25: Obscuring Aether has no effect on spells that instruct you to manifest cards.
2015-02-25: Note that Obscuring Aether doesn't have a morph cost. Once it's turned face down, it doesn't have a way to turn itself face up.