If you control a Ninja card or a face-down Defense Position monster: You can Special Summon this card from your hand. When your opponent activates a monster effect (Quick Effect): You can target 1 face-down Defense Position monster you control; change it to face-up Defense Position, and if you do, change this card to face-down Defense Position, then, if the targeted monster was a Ninja monster, except Mitsu the Insect Ninja , negate that opponent s activated effect. You can only use each effect of Mitsu the Insect Ninja once per turn.