Blaivken, Plague Bringer

+1: Put a -1/-1 counter on target creature you don't control, draw a card.
-1: Move all -1/-1 counters on target creature to another target creature you don't control, and destroy the first target.
-8: Put -1/-1 counters on all creatures opponents control, opponents discard 2 random cards and take damage equal to the converted mana cost.