Pupitar, Hard Shell

As long as Pupitar has a -1/-1 counter on it,
it gets +2/+0.
{2}, {t}: Target creature can't attack until end of turn.
{2}{b}, {t}: Destroy target tapped white creature.
{4}, {t}: Pupitar deals 2 damage to target creature and 2 damage to another target creature.
{5}, {t}: Destroy target creature. Pupitar doesn't untap during your next untap step.