Red Dragon Archfiend

DARKSynchro/Effect Monster

1 Tuner + 1 or more non-Tuner monsters After damage calculation, when this card attacks a Defense Position monster your opponent controls: Destroy all Defense Position monsters your opponent controls. During your End Phase: Destroy all other monsters you control that did not declare an attack this turn. This card must remain face-up on the field to activate and to resolve this effect.