Solfachord Formal (ANGU-EN026) [Ancient Guardians]

While you have a "Solfachord" card(s) in your Pendulum Zone, when your opponent activates a Spell/Trap Card, or monster effect: Shuffle 1 face-up Pendulum Monster from your Extra Deck into the Main Deck, then apply these effects.
<br>• Pendulum Monsters you control are unaffected by that effect.
<br>• Cards in your Pendulum Zone cannot be destroyed by that effect.
<br>• Cards in your Pendulum Zone cannot be banished by that effect.
<br>You can only activate 1 "Solfachord Formal" per turn.