When your opponent activates a monster effect, or a Spell/Trap Card and you control a "Doremichord" card in your Pendulum Zone: Shuffle 1 Pendulum Monster from your face-up Extra Deck into the Deck, then, apply these effects.
● Pendulum Monsters you control are unaffected by that opponent's effect.
● Cards in your Pendulum Zones cannot be destroyed by that opponent's effect.
● Cards in your Pendulum Zones cannot be banished by that opponent's card effect.
You can only activate 1 "Doremichord Formal" per turn.