Red Dragon Archfiend (Quarter Century Secret Rare)

DARKSynchro/Effect Monster

1 Tuner + 1+ non-Tuner monsters After damage calculation, if this card attacked an opponent's Defense Position monster: Destroy all Defense Position monsters your opponent controls. Once per turn, during your End Phase: Destroy all other monsters you control that did not declare an attack this turn. This card must be face-up on the field to activate and to resolve this effect.