Altar of Dementia [Tempest] The Legend of Blue Eyes White Dragon You can activate this effect

You can activate this effect during either player's turn

when your opponent activates a monster effect (Quick Effect): You can detach 1 material from this card

Set: Galactic Overlord Card type: Xyz/Effect Monster Rarity: Secret Rare Attack: 700 Defense: 700 3 Level 7 monsters You can detach 1 Xyz Material from this card

" —Barrin

Altar of Dementia [Tempest] The Legend of Blue Eyes White Dragon You can activate this effectSet: Tempest Type: Artifact Rarity: Rare Cost: {2} Sacrifice a creature: Target player mills cards equal to the sacrificed creature's power. "It is not that you will go mad. It is that you will beg for madness." Volrath