Just an added idea in case you'd be interested in trying the Armageddon route: Throw in a set of devastating summons to sacrifice your own lands into fatties before destroying them. This could be instead of the kazuuls.
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It looks like this deck can pump out most of it's creatures in turn 2-5, but after that you'll possibly run out of real threats to play and lack the means to support the army of little first striking withers. I'd suggest either adding more burn / permanent removal to get you through the last turns needed to get the opponent down, or simply deny them the chance to get anything out past turn 5 at all, by splashing some white and throwing down an Armageddon: You'll have most of your army on the table by then, and they won't have any real chance to disrupt it while you finish off what you started the first turns.