مستحضر سحر الظلام

Cannot be Normal Summoned/Set. Must be Special Summoned (from your hand) by Tributing 2 Level 6 or higher Spellcaster-Type monsters, and cannot be Special Summoned by other ways. During either player's turn, when a Trap Card is activated: You can negate the activation, and if you do, destroy it. This card must be face-up on the field to activate and to resolve this effect.