Serthin, Unholy Angel

+2: Put as many -1/-1 counter on target creature as you want. for every -1/-1 counter past the second, lose two life and pay {1}.
-3: Untap one mountain, plain, or swamp, and remove any number of -1/-1 counters from target creature. For each -1/-1 counter, gain 1 life.
-9: Put a -1/-1 counter on all of your opponent's creatures. Destroy the creature on the battlefield with the most -1/-1 counters.