Each time your opponent takes damage from a card effect, except "Dark Room of Nightmare", inflict 300 damage to your opponent.
Rulings
Individual Card FAQs
A cost is not damage so this card's effect does not apply against "Chain Energy", or costs for "Imperial Order", etc.
Netrep Q&As
Q: Would the opponent receive damage from “Dark Room of Nightmare” when losing Life Points from the effects of “Toll” and “Chain Energy”? A: The effect of “Toll” and “Chain Energy” is not damage, so “Dark Room of Nightmare” will have no involvement in those card's effects. Curtis Schultz, 01/22/2004
Spell|
Continuous