Number 69: Heraldry Crest - Dark Matter Demolition

[ Psychic / Xyz / Effect ] 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; its name becomes "Unknown". When a monster effect activated by your opponent resolves, if that monster's name is "Unknown", negate that activated effect. ATK/ 3100 DEF/ 1900