Vaal Hazak, Miasma Dragon

Vaal Hazak deals damage in the form of -1/-1
counters.
{x}{b}{b},{t}: Put a -1/-1 counter on up to X target creatures opponents control.
{4}{b}{b}, remove X -1/-1 counters from creatures opponents control: Vaal Hazak gets +X/+X until
end of turn.