After this card was flipped face-up, while it is in the Monster Zone, each time your opponent adds a card(s) to their hand by their card effect, they take 900 damage for each card. When your opponent activates a card or effect in response to your card or effect activation (Quick Effect): You can change this face-down card to face-up Defense Position; return up to 3 cards from the field to the hand. You can reveal this card in your hand; Special Summon 1 monster from your hand in face-down Defense Position. You cannot Special Summon the turn you activate this effect, except in face-down Defense Position.