Must first be either Fusion Summoned, or Special Summoned from your Extra Deck by Tributing the above cards you control. Your Ninja monsters can attack directly. While you control a face-down Defense Position monster, your opponent s monsters cannot target this card for attacks. When your opponent activates a card or effect (Quick Effect): You can Special Summon 1 Ninja monster from your Deck in face-up or face-down Defense Position. You can only use this effect of Meizen the Battle Ninja once per turn.