D/D/D Super Doom King Purple Armageddon (MP19-EN230) - 2019 Gold Sarcophagus Tin Mega Pack 1st Edition

Pendulum Effect
Once per turn, before damage calculation, if your "D/D/D" Fusion Monster battles an opponent's monster: You can make that opponent's monster lose 1000 ATK until the end of this turn (even if this card leaves the field).
Monster Effect
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.