I think three more supernovas, a permafrost, a jade shield, 2 reflective shields, two PA's, and two more towers would make the deck FG ready. Switch to an entropy mark. I used it as is and almost beat seism, would have lost by deck out though (he managed to kill me with about 4 cards left in my deck).
No one uses rainbows that rely on eternity to not deck out in PvP. And yes, fractal devourers are a problem, but you really can't counter everything...