Effect: This card cannot attack your opponents lp directely. When this card attacks a defense position monster, desrtoy it without damage calculation and its effect is not activated.
This card can only be activated if "Zetsumei Hebi" is destroyed as a result of battle. All monsters on your opponents side of the field reduce their atk and def by 200 every turn until both atk and def hit 0 and they are desrtoyed(only the monsters on your opponents side of the field at the time of the destruction).
Effect: This card can attack your opponents lp directely, if it does inflict only half the damage.