Enchantment — Aura, 1G (2)
Special
Enchant land
Whenever enchanted land is tapped for mana, its controller adds one mana of any color to his or her mana pool (in addition to the mana the land produces).
The forest was too lush for the brothers to despoil—almost.
Illus. Heather Hudson

10/4/2004: The color of mana to be generated is chosen when tapping the land for mana.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Classic (MTGO)
Legal in Commander
Legal in Modern