Advanced format ruling
Crimson Fire
Card effect (current official text)When your opponent activates a Spell/Trap Card that would inflict damage to you, while you control a "Red Dragon Archfiend": Your opponent takes twice the effect damage you would have taken, instead.
Current rulings for this card are maintained by Konami.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Advanced forum — sourced change requests get reviewed.