I got to KOG using this deck! My extra deck is 3 bracchioraidus and 2 twin headed thunder dragon. I think that my deck version is the easiest to play. Usually I can pull off a twin headed thunder dragon on turn 1 or 2. After I do that, my chances of losing become very slim. I put in 3 polymerization instead of 2 to increase the chance of playing twin headed thunder dragon right at the start of the game. There is a lot of removal in this deck (michizure, mirror wall, order to charge) that help maintain tempo. My advice in playing this deck is to: not fusion summon if you are going first (opponent can sometimes screw you over with riyoku or order to charge), be aggressive (most of the time) and attack even if you think your opponent has mirror wall and remember to use element saurus with your earth monsters to negate death or flip effects. If you do all of that, then you can get KOG easy. From gold 4 to KOG, I had a 90% winrate with this deck. High winrate is guaranteed if you pilot this deck correctly.