Card Rulings:Ghost of a Grudge

OCG Rulings

 * This card does not target.


 * This card can be activated during the Damage Step, but not during damage calculation.


 * This card cannot be activated if the opponent does not control any face-up monsters.


 * This card cannot be activated if the only face-up monsters the opponent controls have 0 ATK.


 * A monster that has its ATK reduced to 0 by this card remains with its ATK reduced as long as it remains face-up on the field.