Clock Arc (Common)

Pendulum Effect: Once per turn, during your opponent's Standby Phase: You can Special Summon this card from your Pendulum Zone. While you control no monsters, and while every monster you control is a Pendulum Monster, apply this effect based on your Pendulum Zone this card is in.
? Left: Reduce this card's Pendulum Scale by 3.
? Right: Increase this card's Pendulum Scale by 4.
Monster Effect: If this card is Special Summoned to a Main Monster Zone that is not the center Main Monster Zone, destroy this card. Cannot be destroyed by battle. Once per turn, during your opponent's End Phase: You can target 1 card in your Pendulum Zone; destroy it, and if you do, place this card in your Pendulum Zone.