Edison format ruling
Red Dragon Archfiend/Assault Mode
Card effect (current official text)This card cannot be Normal Summoned or Set. This card cannot be Special Summoned except with "Assault Mode Activate". If this card attacks, destroy all other monsters after damage calculation. When this card on the field is destroyed, you can Special Summon 1 "Red Dragon Archfiend" from your Graveyard.
Rulings
- The effect that destroys all other monsters will activate even if "Red Dragon Archfiend/Assault Mode" is destroyed by battle.
- You cannot Special Summon a Synchro Monster that was sent directly to the GY and was never properly Summoned.
- The last effect targets the "Red Dragon Archfiend" in the GY.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Edison forum — sourced change requests get reviewed.