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