The Covenant

Creatures you control gain +2/+2 for every
different creature race and artifact under your
control.
At the beginning of your upkeep, roll and d20,
subtract the number of different creature races
you control, and add the number of artifacts you
control. If the result is 5 or less, sacrifice
The Covenant.
If a card named Halo Array is tapped on the
battlefield while you control The Covenant,
you win the game.