I'd have to agree about adding some flyers. You've got some solid defense there, but fliers tend to cover your air, and if you can spam the board with cheap fliers it can put pressure on your opponent so they don't focus all their defense on your milling and can't get the initiative. Also, if you can find them, Belltower Sphinxes are a bit pricy mana wise, but absolutely beautiful in a mill deck. Basically if they don't have removal they're not getting past the Sphinx without milling at least six cards, and they fly on top of it.
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