Ancient Ziggurat's "any colour" mana is useless except for summoning your Abuna Acolytes (they can't be used to activate Auriok Replica's ability either) so I don't know why they're in there. There are so many better lands that produce colourless mana, and yeah, you can only have 4. If you want to keep white in the deck I maybe even suggest putting some plains in there in case of the rare chance someone has a card that rapes non-basics. Also Scepter of Dominance is kinda cool for a white artifact. You have a lot of high-powered, high-cost creatures, I'd consider putting more non-land mana sources in so you can get them out a LOT quicker :D. On that topic, if you're going to have (only 4 sorry) Glimmerposts in your deck, also add Cloudpost. MASSIVE mana source :D
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I'd maybe go for Mana Short instead of Early Frost, if you don't mind the extra (1), more applications ;]