Rakdos Executioner

Unleash (You may have this creature enter the battlefield with a +1/+1 counter on it. It can't block as long as it has a +1/+1 counter on it.)
When Rakdos Executioner enters the battlefield, destroy target creature an opponent controls at random.
{1}{b}{r}, {t}: Target creature gets -1/-1 equal to the amount of damage dealt to its controller this turn until end of turn.