Extra Curse 2

On your next turn after your opponent Special Summoned a monster from the Extra Deck, this Skill can be activated while your Extra Deck has less cards than your opponent's. Select 1 opponent monster in the Extra Monster Zone and decrease its ATK/DEF until the end of the turn by the difference in the number of cards between the players' Extra Decks x 100. This Skill can only be used once per Duel.