Number C104: Umbral Horror Masquerade
“Once per turn, during either player’s turn, when a monster effect is activated on your opponent’s side of the field: You can detach 1 Xyz Material from this card; negate the activation, then you can send 1 random card from your opponent’s hand to the Graveyard, and if you do, halve your opponent’s Life Points.“
/i should be drawing something totally diffrent but man his design is sweet