Whenever enchanted player casts a spell, put a spite counter on Curse of Vengeance.
When enchanted player loses the game, you gain X life and draw X cards, where X is the number of spite counters on Curse of Vengeance.
11/8/2016 Curse of Vengeance’s first triggered ability resolves before the spell that caused it to trigger. The ability will resolve even if that spell is countered.
11/8/2016 If you and the enchanted player both reach 0 or less life at the same time, you’ll lose the game before Curse of Vengeance’s second triggered ability gives you more life.