Creature - Elf Druid 1/1, G (1) Tap three untapped Elves you control: Add {G}{G}{G} to your mana pool. "Study the great spirits of our age and those of the past. Prune secrets from the branching traceries of our lineage." —Twila, Gilt-Leaf archdruid
Illus. Larry MacDougall
4/1/2008: Since the activated ability doesn't have a tap symbol in its cost, you can tap creatures (including Heritage Druid itself) that haven't been under your control since your most recent turn began to pay the cost.