Sigil of the Empty Throne | Magic: The Gathering
Formats Sigil of the Empty Throne is Legal in
Official Oracle Text for Sigil of the Empty Throne
Official Rulings for Sigil of the Empty Throne
2/1/2009 : When you cast an Aura spell, you have to choose a target for it before this ability puts an Angel token onto the battlefield. In other words, you can't play an Aura spell intending to enchant the Angel that will be created as a result.
2/1/2009 : Casting Sigil of the Empty Throne won't trigger its own ability. It has to be on the battlefield for its ability to work.