Evenly Matched

{t}Sacrifice this enchantment: Target opponent
exiles a number of nonland permanents equal to the
difference between the number of nonland
permanents you control and that they control at
random. You may only activate this ability during
you or your opponents end of combat step.
{2}{w} Discard this card: activate the ability listed
above. You may only do so if you control no nonland permanents.