Text (10): 7/7, Flying, Trample. ; At the beginning of your upkeep, sacrifice a creature other than ~this~. If you can't, ~this~ deals 7 damage to you.
If you have a creature, you must sacrifice it. The 7 damage can only be taken if no creature can be sacrificed. [Duelist Magazine #3, Page 15]
You can sacrifice a Lord of the Pit to a different Lord of the Pit. [Aahz 1994/09/14]
If you have two Lords of the Pit, you can sacrifice them to each other. [D'Angelo 2001/04/16]
You can select creatures with Protection from Black to be sacrificed. [Aahz 1994/04/01]