There are actually a fair number of other God creatures you can play in this deck to break Zodiark's symmetry, like Aclazotz, Deepest BetrayalAclazotz, Deepest Betrayal, God-Eternal BontuGod-Eternal Bontu, and if you're in Modified Bracket or higher, Tergrid, God of FrightTergrid, God of Fright, which is particularly brutal alongside Zodiark
This was my first big hint that there would be more Pokemon games coming out and I was hyped beyond belief
If the blocking creatures power is equal to (or higher than) the attacking creatures defense, the attacking creature dies
(See the aforementioned Ghostway for ideas of other ways to keep people safe.) The only issue I have (other than a mana investment) is that it's harder to build around with things like Darksteel Forge or Bloodghast (tricks you could use with an Oblivion Stone to make things unfair)
By their nature, cuts will vary on what direction you take the deck, and who you are playing with, so these are just a few ideas of cards I think you can cut: Whirler Rogue Hornet Queen Search the Premises Selvala, Explorer Returned Innocuous Researcher Serene Sleuth Finale of Revelation Ransom Note Teferis Ageless Insight Knowledge is Power These aren't necessarily bad cards, but ones you might upgrade on with some of the other options, or may move from on if you take the deck in certain directions