Number 69: Heraldry Crest - Dark Matter Demolition

Level 4 LIGHT/Psychic Xyz Effect
3100 ATK / 1900 DEF

5 Level 4 monsters
Cannot be destroyed by battle or card effects. Once per turn (Quick Effect): You can detach 1 material from this card, then target 1 face-up monster your opponent controls; that monster's name becomes "Unknown". Negate any "Unknown" effects activated by your opponent.

Rulings – Yugipedia

Printings:

Alliance Insight: ALIN-EN046 (Quarter Century Secret Rare) - 2025-05-01
Alliance Insight: ALIN-EN046 (Ultra Rare) - 2025-05-01

Prices:

Cardmarket: 0.77 €
TCGplayer: $ 0.18