Si/Vicious Offering

Kicker— Sacrifice a creature.
Target creature gets -3/-3 until end of turn.
If this spell was kicked, target creature gets
-6/-6 until end of turn instead, if that sacrificed creature was a nontoken sister, you
may pay {b}{p/r}. If you do, create a 4/4 demon creature token with flying, deathtouch and trample.