Creature — Cleric 1/1, B (1)
Common
{1}: Add {B} to your mana pool. If this ability has been activated four or more times this turn, sacrifice Initiates of the Ebon Hand at the beginning of the next end step.
"We are no longer Nature's children, but her masters . . . ."
—Oath of the Ebon Hand
Illus. Heather Hudson

10/4/2004: Mana which "changes color" as it goes through the Hand forgets its original source because the old mana gets used up and new mana gets generated.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Commander