Dirge of the Lost Dragon

Continuous Spell

Activate this card by declaring 1 card name. Each time the declared card, or its effect, is activated, halve its owner's LP immediately after it resolves. During the End Phase, if this card halved a player's LP this turn, send this card to the GY. While your opponent controls a monster, this card cannot be destroyed by card effects.

Rulings – Yugipedia

Printings:

Dark Neostorm: DANE-EN063 (Super Rare) - 2019-05-02
2020 Tin of Lost Memories Mega Pack: MP20-EN079 (Ultra Rare) - 2020-08-27

Prices:

Cardmarket: 0.05 €
TCGplayer: $ 0.14