The World of Spirits

When this card is activated: You can add 1 monster that mentions "Ancient Fairy Dragon" from your Deck to your hand. You can only activate each of the following effects of "The World of Spirits" while you control a Level 7 or higher LIGHT Dragon Synchro Monster. Each time a monster(s) is Special Summoned in Attack Position: Change it to Defense Position. Once per turn, during the End Phase: Destroy all the turn player's Attack Position monsters. You can only activate 1 "The World of Spirits" per turn.