Buster Blader, the Destruction Swordmaster 018

Card text

This card's name becomes "Buster Blader" while it is on the field or in the Graveyard. If a monster(s) your opponent controls is destroyed by battle or card effect and sent to the Graveyard: You can target 1 of those destroyed monsters; equip it to this card. Once per turn: You can send 1 Monster Card you control that is equipped to this card to the Graveyard; destroy all monsters your opponent controls with the same Type as that monster sent to the Graveyard.