Card Rulings:Hidden Temples of Necrovalley

OCG Rulings

 * This card can be activated even if the opponent controls both "Necrovalley" and a "Gravekeeper's" monster.


 * If either "Necrovalley" or a "Gravekeeper" monster is destroyed, so that both of them are not on the field, this card is immediately destroyed. (It is destroyed even if it's the opponent's turn.)