Jack, Unexistence Master

When Jack, Unexistence Master enters the
battlefield, create twice X blue and red and
white 3/1 Unexistence creature tokens.
{t}: Whenever a creature token would die this
turn, instead tap it and put a +1/+1 counter on it.
{ut}, Exile all creature tokens you control: put an X/X colorless army creature token onto the battlefield, where X is the number of creatures exiled.