Tengu 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.
Rulings
- If the opponent activates a card that inflicts damage to both players, such as Tremendous Fire, and you respond with "Crimson Fire," you take no damage and your opponent takes 2500 damage (the 500 normal, plus double the 1000 damage you would have taken).
- If you control "Red Dragon Archfiend/Assault Mode" but not "Red Dragon Archfiend," you cannot activate "Crimson Fire."
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Tengu forum — sourced change requests get reviewed.