D/D/D Super Doom King Purple Armageddon [MP19-EN230] Super Rare

2 "D/D/D" monsters You can target 1 Attack Position monster your opponent controls; destroy it, and if you do, inflict damage to your opponent equal to half its original ATK. You can only use this effect of "D/D/D Super Doom King Purple Armageddon" once per turn. Before damage calculation, if an opponent's monster battles: You can make its ATK become equal to its original ATK until the end of the Damage Step. If this card in the Monster Zone is destroyed: You can place this card in your Pendulum Zone.