If you're like me, simply damaging your opponent's life to 0 is simply not exciting enough. So I always try to look for ways to defeat my opponents indirectly with certain cards and alt win conditions (such as Mill and Poison).
So that's how I became a Miller...but besides that I would like to know what your favorate alt win condition is (anything other than dmaging to 0 life)
Example of alt win cards are: Darksteel Reactor, Test of Endurance, etc. (any card that says "....You Win the Game")