Mystic Swordsman LV6 (LCYW-EN202) - Legendary Collection 3: Yugi's World 1st Edition

If you Normal Summon this card, you must place it in face-down Defense Position. If this card attacks a face-down Defense Position monster, destroy the monster immediately with this card's effect without flipping it face-up or applying damage calculation. You can return the monster destroyed with this effect to the top of its owner's Deck, instead of sending it to the Graveyard.