Enchantment, 1W (2)
Uncommon
Whenever an opponent taps a Mountain for mana, you may gain 1 life.
"To forgive our enemies is to forgive ourselves."
Illus. Mark Brill

10/4/2004: Gaining life is optional. If you forget, you can't go back later even if it is something you usually do.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Classic (MTGO)
Legal in Commander
Legal in Modern