Card Rulings:Hierophant of Prophecy

OCG Rulings

 * Detaching 1 Xyz Material is a cost.


 * This effect doesn't target. The Spell and Trap Cards to be destroyed are chosen when the effect resolves.


 * If there are no Spell or Trap Cards to be destroyed, the effect cannot be activated.


 * If there are no "Book of Spell" Spell Cards in your Graveyard, the effect cannot be activated.