Enrage the Murky Waters

Each of your endsteps you may have all {u} and {b} creatures you control fight target creatures
you don't control. Each creature that you don't control that died from fighting each turn you
use this ability target opponent loses 1 life.
{4}{u}{b}, Sacrifice a creature: You win the game
unless an opponent controls a creature.
"When you enrage darkness, it's bad. When you
enrage water, it's bad. Now think of them combined."