It does seem slow for a naya deck...you might want to consider adding something like Wild Nacatl and taking out volcanic fallout or naya charm. I like Uril and the Spellbreaker though, good value for their power and they have some serious staying power.
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Lord of Extinction is fun with a mill deck...I did something similar, but used Necromancer's Covenant as my win condition instead. I like it though.
m4kahkon