Dragon's Claw
Magic 2012 — uncommon
Artifact
Dragon's Claw rulings:
2009-10-01: The ability triggers whenever any player, not just you, casts a red spell.
2009-10-01: If a player casts a red spell, Dragon’s Claw’s ability triggers and is put on the stack on top of that spell. Dragon’s Claw’s ability will resolve (causing you to gain 1 life) before the spell does.