you use 8 cards to combo. you can reduce 3 (dimension, sumonner and 1 union trap) and add 2 cards (megacyber and enemy controller). 1slot liberated do something about defense, 3 cards sucks, you can add field spell (cheap acid downpour), because only 3 is a bad idea, maybe sword of deep seated. you need increase that defense. For now your deck is 50%, because he uses his 3300 fat guy x3.
Thanks for the tips, I put 2 acid rain and 2 explorer, the deck is much better, practically always left with a rain or explorer in the initial hand, I just made 8600 using this deck