The Phantom Knights of Torn Scales (MP21-EN168)

You can discard 1 card; send 1 "Phantom Knights" card from your Deck to the GY, except "The Phantom Knights of Torn Scales". If another "Phantom Knights" card in your GY is banished, while this card is in your GY: You can Special Summon this card, but banish it when it leaves the field. You can only use each effect of "The Phantom Knights of Torn Scales" once per turn.

Warrior / Effect, 2021 Tin of Ancient Battles