Silent Swordsman Zero (Quarter Century Secret Rare)

Once per turn, during the Standby Phase: Increase this card's Level by 1. While this card's Level is higher than its original Level, it gains ATK equal to the difference x 500. When your opponent activates a card or effect that targets "Shining Sarcophagus", or a monster(s) that mentions it, that you control (Quick Effect): You can negate the activation, and if you do, increase this card's Level by 1. You can only use this effect of "Silent Swordsman Zero" once per turn.