جوهر التنين

When a Spell/Trap Card, or monster effect, is activated and you control a monster with 2500 original ATK or DEF: Negate the activation, and if you do, destroy that card. If this card is in your GY: You can pay 2500 LP; Set this card, but banish it when it leaves the field. You can only use each effect of "Dragon's Mind" once per turn.