Ghostrick Doll (PRIO-EN022)

Cannot be Normal Summoned, unless you control a "Ghostrick" monster. Once per turn: You can change this card to face-down Defense Position. When this card is flipped face-up: During this turn's End Phase, change all face-up monsters on the field to face-down Defense Position, then you can Special Summon 1 "Ghostrick" monster from your Deck in face-down Defense Position, whose Level is equal to or less than the total number of monsters changed to face-down Defense Position.