Skull, the Chariot

{r}{r}: Skull, the Chariot deals X damage to target creature an opponent controls, where X is the
number of creatures that you control.
{b}{b}: If Skull, the Chariot would be destroyed by damage this turn, it remains on the battlefield.
{b}{r}: Target creature gains +0/+X, where X is
equal to Skull, the Chariot's toughness.