LoreTarget 1 DARK Xyz Monster you control; Special Summon from your Extra Deck, 1 "Ghostrick" monster that is 1 Rank higher than that monster you control, by using it as material, then return all Set cards your opponent currently controls to the hand. (This is treated as an Xyz Summon. Transfer its materials to the Summoned monster.) You can banish this card and 1 "Ghostrick" monster from your GY, then target 1 face-up monster on the field; change it to face-down Defense Position, then you can Special Summon 1 Rank 4 or lower DARK Xyz Monster from your GY. Monsters changed to face-down Defense Position by this effect cannot change their battle positions.