Using a deck with Ruby Dragons, Precogs, TUs, Sky Blitz, and a couple Fractals, it's easy to do 390, just have to restart until you get the right cards. 1 Sky Blitz, 1 Ruby Dragon, 5 TU, 1 Fractal. You play your Dragon, TU it 5 times, then Fractal it and play those. Then Sky Blitz. You can get 300+ fairly consistently with this method, 390 is the max. I'm sure 390 isn't the maximum possible, but that was the first thing I thought of reading this thread. Only tried a couple times, and I hit 360. Didn't actually get the 390.