Pact with the Pit

As an additional cost to cast Pact with the Pit,
sacrifice a non-Demon creature.
When Pact with the Pit enters the battlefield,
create a 7/7 black Demon creature token with
flying and trample named Lord of the Pit.
At the beginning of your upkeep, sacrifice a non-
Demon creature. If you can't, tap all Demons
you control and you lose 7 life.