try wight of precinct six, he's perfect for this idea

Nighthowler Consuming Aberration

Desecration Demon to keep opponents on their toes.More Mortivore if it's your main win con.

May i ask why you use only one copy of so many different cards??? You would really improve this deck my selecting a set few and running more copies of it.

@mikeyuhr these are the cards I already have, I have not decided if I going to use them or not till I play test the deck, then I will get more of them

Codex Shredder is a nice addition to most mill decks.

Glimpse the Unthinkable , Breaking / Entering , and Mind Grind

Great deck!I would put Demonic Tutor instead of Diabolic Tutor since it is simply superior.Also, Dimir Aqueduct would allow You to re-use your Temple of Deceit so I would put four of each in the deck instead of basic lands.Mind Grind is also very powerful if You have enough mana and several opponents.I do not think Doorkeeper is worth the slot in this deck however. So many cards would be more useful!

The problem with Mind Grind is the CMC... Id give Breaking a try, youll never Duskmantle Guildmage + Mind Grind to work 2gether... at turn 8 but they he can work with some milling sorceries.

Also Jace's Phantasm is a great deal, 5/5 and flying for 1 mana

Arvixu I have been looking for a replacement for Paranoid Delusions . I'll give Breaking a try

Good good btw it wasnt Mind Grind i meant to say Traumatize

There is a lot I have to say here. Unfortunately, it's 2:30AM for me so I need sleep, but I will return tomorrow to give you a full overview. For now, if you're looking for control (which I highly suggest), try Thoughtseize , Inquisition of Kozilek , Smother , Duress .

Take a look at this mill deck that I made, it may give you some ideas.

As Your Power Wanes, Mine Grows

In the meantime, ask yourself a few questions:

Is your win-con Duskmantle Guildmage + Mindcrank ? If so, you may want some more supporting cards, such as tutors.

Is your win-con milling then killing? If it is, throw in another few Consuming Aberration in there, as well as 3 Aqueous Form for the 1-hit-KO.

Is your strat pure mill? If this is the case, get rid of a lot of your creatures in favor of hard mill cards like Glimpse the Unthinkable , Mind Funeral and Jace, Memory Adept . (Mirko Vosk, Mind Drinker is fine, but things like Consuming Aberration are simply not.

The biggest immediate issue that I see with your deck is a lack of focus. Figure out what it is you want to do, then streamline your deck around it. If you want suggestions on how to streamline your deck to a specific aspect of milling, let me know.

(also, dream twist is not a great card. Get rid of it for either Glimpse the Unthinkable or at the very least a Mind Sculpt , although more control would be better in it's place.)