Book of Eclipse - RA02-EN054 (SR) (Yugioh)
Quick-Play Spell
Change all face-up monsters on the field to face-down Defense Position. During the End Phase of this turn, change as many face-down Defense Position monsters your opponent controls as possible to face-up Defense Position, then your opponent draws cards equal to the number of monsters changed face-up by this effect.
Attack: -
Defense: -
Attribute: SPELL