Liege of the Pit
Creature — Demon
Flying, trample
At the beginning of your upkeep, sacrifice a creature other than this creature. If you can't, this creature deals 7 damage to you.
Morph (You may cast this card face down as a 2/2 creature for 
. Turn it face up any time for its morph cost.)
Jeremy Jarvis
Time Spiral (TSP)
• #113Rulings
If you have another creature on the battlefield when the ability resolves, you must sacrifice it. You can’t choose to be dealt 7 damage instead.
(wotc • 2006-09-25)
You can’t sacrifice Liege of the Pit to its own ability. You can sacrifice one Liege of the Pit to another Liege of the Pit.
(wotc • 2006-09-25)
Rulings
If you have another creature on the battlefield when the ability resolves, you must sacrifice it. You can’t choose to be dealt 7 damage instead.
(wotc • 2006-09-25)
You can’t sacrifice Liege of the Pit to its own ability. You can sacrifice one Liege of the Pit to another Liege of the Pit.
(wotc • 2006-09-25)