Demon of the Dark Pact

When Demon of the Dark Pact enters the battlefeild, Sacrifice 13 permanents.
Haste, Trample, Flying, Deathtouch, Lifelink.
If Demon of the Dark Pact wold be put into the graveyard from anywhere you may pay
{2}{b}{b}, if you do put Demon of the Dark Pact onto the battlefield and sacrifice 7 permanents instead of 13.