Obelisk of Withering

+1: Until your next turn, if a creature dealt damage to the Obelisk of Withering, put a -1/-1 counter on that creature.
-2: Destroy target creature with a -1/-1 counter.
-X: Use this ability only to bring the Obelisk of Withering to 0 loyalty counters. Put two -1/-1 counters at each creature you don't control.