If this card is Normal or Special Summoned: You can discard 1 "Memento" card, then target 1 Spell/Trap your opponent controls; destroy it. During your Main Phase: You can destroy 1 "Memento" monster you control, and if you do, Special Summon 1 Level 3 or lower "Memento" monster from your Deck. You can only use each effect of "Memento Dark Blade" once per turn.