Cruel Seductress

Pact (At the beginning of your upkeep, sacrifice a creature or pay life equal to this creature's converted mana cost.)
If Cruel Seductress' pact was paid with sacrifice this turn, target creature gets -2/-1 until end of turn. Otherwise, Cruel seductress gets +1/+1 until end of turn.
"I will gladly show you the depths of what I can offer you... For a price, of course."