Dragocytos Corrupted Nethersoul Dragon

1 DARK Tuner + 1 Dragon-Type non-Tuner monster Cannot be destroyed by battle. When this card destroys an opponent's monster by battle and sends it to the Graveyard: You can activate this effect; this card can make a second attack on an opponent's monster in a row. During each of your Standby Phases: You can target 1 face-up monster your opponent controls; its ATK becomes half its current ATK, and if it does, inflict damage to your opponent equal to that lost ATK