Cursed Bride Doll

When you draw this card: You can reveal it; Special Summon this card. At the start of each Battle Phase: If there are more cards in your Deck than your opponent's, this card gains ATK equal to the difference x 300, until the end of this turn. Once per turn, during the End Phase, if this card is in the GY because it was sent there this turn: Place this card on top of the Deck.