Reverse Jar (MP23-EN077) - 25th Anniversary Tin: Dueling Heroes Mega Pack 1st Edition

FLIP: Change as many other monsters on the field as possible to face-down Defense Position, then, return as many face-up Spells/Traps as possible from the field to the hand, then, each player can Set Spells/Traps from their hand, up to the number returned to their own hand by this effect. You can only use this effect of "Reverse Jar" once per turn.