Gem-Knight Topaz (HA05-EN021) [Hidden Arsenal 5: Steelswarm Invasion]

Gem-Knight Tourmaline + 1 "Gem-Knight" monster // Must first be Fusion Summoned using the above Fusion Material Monsters. This card can attack twice during the same Battle Phase. When this card destroys an opponent's monster by battle and sends it to the Graveyard: Inflict damage to your opponent equal to that monster's ATK.