Creature — Cleric 1/1, B (1)
Common (C1)
{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.
"Many Initiates sacrificed a hand to become full members of the Order."
—Sarpadian Empires, vol. II
Illus. Kaja Foglio

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