Ob Nixilis of Power

+3: Chose a color. Destroy target creature of that color. Create a 2/2 Ob Nixilis servent creature token that is the chosen color.
-3: Chose a color. Destroy up to 5 creatures of that color. Create 5 7/7 Ob Nixilis warrior creature tokens that are the chosen color.
-12: Gain control of your opponents library.