Lilith, Mother Of Demons

Bargain 3 (When this creature comes into play, target creature(s) you control equal to bargain cost get-1/-1.
This creature gets +1/+1 for each -1/-1 bargained for.)
Bondage (This creature and another target creature
you control with Bondage that shares a type, gain each others abilities).
Flying.
All other Demons you control get +2/+2.
{3}; Sacrifice creatures with converted mana cost
equal to target creature in your graveyards' casting
cost. Return it to your battlefield tapped