It's impossible for me to lose anymore. I have a selection of decks. (Harpy, Full out duelist massacre and either a Zombbie, Machine or Dinosaur deck. Even an insect deck if I get bored) Simple combo really Ryoko(or whatever it's called, the one that halves the LP of the opponent) and The ulitmate blue eyes white dragon. Fretty much leaves you unstoppable. Or you can bulk up slot machine or metal zoa with a couple of cards. Pretty simple.
Average wins: 5000+