Once per turn, during the Battle Phase: You can activate 1 of these effects. // * Target 1 "Ghostrick" monster you control; change it to face-down Defense Position and change 1 face-down Defense Position monster your opponent controls into face-up Attack Position. // * Target 1 face-down Defense Position monster you control; change it to face-up Attack Position, and if you changed the battle position of a “Ghostrick” monster this way, change 1 face-up monster your opponent controls to face-down Defense Position.