Enchantment, 3B (4)
Uncommon
At the beginning of your upkeep, sacrifice Breeding Pit unless you pay {B}{B}.
At the beginning of your end step, put a 0/1 black Thrull creature token onto the battlefield.
The thrulls bred at a terrifying pace. In the end, they overwhelmed the Order of the Ebon Hand.
Illus. Adrian Smith

10/4/2004: Breeding Pit must actually be on the battlefield at the beginning of the endstep in order for you to get a Thrull. The getting of the Thrull is not part of paying the upkeep, it is part of having the card on the battlefield.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Classic (MTGO)
Legal in Commander