The owner of this deck hasn't added a sideboard, they probably should...
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Personallly I feel that for a mill deck you must devote all or your spells to the win condition so you have maximum potential. I'd ditch the:Swans (Its designed for an Azorius Control Deck)Alchemist (Zombie MILGGRO [Mill+Aggro])Ascension (Life Gain/Drain)Aetherise (its ok but you have more uses for those spaces)Catacombs (not as good as others like the scry lands)and put in more things like:Keening StoneNephalia DrownyardCodex ShredderAshiok, Nightmare WeaverMind Sculptand where is the most common TOME SCOUR!??
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I mostly agree with what you're saying, the deck isn't focused enough on the main goal. But I disagree with the comment about the Drowned Catacombs. Catacombs may not have a fancy ability like scry, but it does enter the battlefield untapped, and that in its own is very important.