That Which is Not

When That Which is Not enters the battlefield, destroy all other creatures.
That Which is Not cannot be blocked.
If you control no other non-land permanents, That Which is Not is a creature.
At the beginning of your upkeep each opponent sacrifices a permanent of each card type.
{t}:Exile a non-land permanent
{t},{p/b}{p/b}{p/b}{p/b}{p/b}{p/b}{p/u}{p/u}:Put all permanents in exile onto the battlefield