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.
Meh card, since not only it is limited to Effect Damage, it's also limited to Effect Damage caused by Spell/Trap only (so it doesn't counter Effect Damage from monsters), and requires you to control a specific Synchro monster. Not worth it.
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