Red Dragon Archfiend [TDGS-EN041] Ultra Rare 178 when an attack is declared

when an attack is declared involving a monster you control and an opponent's monster: You can activate this effect

It exemplifies the motto of the Luminary League: "Innovation requires insatiable curiosity and a good source of light

The Arbiter is a conduit of justice

that masterless little kami

except "Number C" monsters

Red Dragon Archfiend [TDGS-EN041] Ultra Rare 178 when an attack is declaredSet: The Duelist Genesis Card type: Synchro Effect Monster Rarity: Ultra Rare Attack: 3000 Defense: 2000 1 Tuner + 1 or more non Tuner monsters If this card attacks a Defense Position monster your opponent controls, destroy all Defense Position monsters your opponent controls after damage calculation. During your End Phase destroy all other monsters you control that did not declare an attack this turn.