Buster Blader, the Destruction Swordmaster (SBCB-EN182) [Speed Duel: Battle City Box]

This card's name becomes "Buster Blader" while it is on the field or in the GY. If a monster(s) your opponent controls is destroyed by battle or card effect and sent to the GY: 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 GY; destroy all monsters your opponent controls with the same Type as that monster sent to the GY.