Subject: pestilence combo-Lord Moo
here's the combo:

Pestlience 2 uncolorless 2 black mana
enchantment
At the end of each turn if there are no creatures in play, sacrifice pestilence.
B:Pestilence deals 1 damage to each creature and player.

Urza's armor 6 uncolorless
artifact
Whenever a source deals damage to you, that damage is reduced by 1.

All you do is pay any amount of mana and deal that much damage to every creature and player except for you.