Demon's Horn
Magic 2010 — uncommon
Artifact
Demon's Horn rulings:
2009-10-01: The ability triggers whenever any player, not just you, casts a black spell.
2009-10-01: If a player casts a black spell, Demon’s Horn’s ability triggers and is put on the stack on top of that spell. Demon’s Horn’s ability will resolve (causing you to gain 1 life) before the spell does.