Slytherin, The Pure

0: Place X loyalty counter on Slytherin where X is equal to the number of monocolor creatures you control. Draw a card and lose 1 life.
-3: Destroy target creature. If that creature was multi-colored, gain three life and Scry 1.
-9: Destroy all nonblack Creatures and nonblack Planeswalkers. Draw a card for each creature destroyed this way.