Crimson Fire

Edison Card Text
Activate only when your opponent activates a Spell or Trap Card that inflicts damage while you control a face-up "Red Dragon Archfiend". You take no damage, and your opponent takes twice the effect damage you would have taken, instead.
Raging Battle • 2009-05-12
No targeting
No Damage Step effect
Banlist • Unlimited
Rulings
edisonformat.net
●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 can't activate “Crimson Fire.”
edisonformat.com
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.”