Enchantment — Aura, G (1)
Common
Enchant land
Whenever enchanted land is tapped for mana, its controller adds {G} to his or her mana pool (in addition to the mana the land produces).
Illus. Mark Poole

10/4/2004: The additional mana is not an ability of the land and is not something the land can produce.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Classic (MTGO)
Legal in Commander