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 Mementotlan Dark Blade once per turn.