Diamond Mare
{2}
Artifact Creature — Horse
Oracle Text
As this creature enters, choose a color.
Whenever you cast a spell of the chosen color, you gain 1 life.
Watch Out
Cast trigger fires even if counteredWatch Out
This triggers when the spell is cast, before it resolves. Even if the spell is countered, the cast trigger still resolves. Copies of spells are not cast, so they won't trigger this.