Amonkhet, Land of fallen Gods

When Amonkhet, Land of fallen Gods
enters or leaves the battlefield, amass 2.
(Put two +1/+1 counters on an Army you control. If you don't control one, create a 0/0
black Zombie Army creature token first.)
{t}: Add {w}, {b} or {r}.
{p/b}: Destroy all creatures and sacrifice Amonkhet, Land of fallen Gods.