2+ Level 10 monsters
If this card is Xyz Summoned: You can attach 1 monster from your Deck to this card as material. You can only use this effect of "Mercurium the Living Quicksilver" once per turn. While this card has material, your opponent cannot activate the effects of monsters in their GY with the same Attribute as a monster in your GY. Once per turn, during the End Phase: Detach 1 material from this card or take 3000 damage.