Mystic Swordsman LV4 (SOD-EN012) - Soul of the Duelist Unlimited

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 cards effect without flipping it face-up or applying damage calculation. During the End Phase of a turn that this card destroyed a monster as a result of battle, send this card to the Graveyard to Special Summon 1 "Mystic Swordsman LV6" from your hand or deck.