مرآة الحلم المرعب

During the End Phase: You can banish this card; activate 1 "Dream Mirror of Joy" directly from your hand or Deck. You can only use this effect of "Dream Mirror of Terror" once per turn. Each time your opponent Special Summons a monster(s), inflict 300 damage to your opponent. This effect is only applied while you control a DARK "Dream Mirror" monster.