Hey Teke, Now that I have your username it is much easier for me to assist in your deck building. I have recently made a dimir deck too. I am unsure of how it performs, but I understand your milling concept. Please take my suggestions as just my opinion, as I am not the brightest in the dimir realm.Hidden strings is a great card, but the cipher ability only works if you are dealing combat damage to a player. With your deck, I don't see you dealing combat damage to a player often. By turn two, a player will be able to ping your Jace's phantasm before you can get its ability. Consider using your invisible stalkers if you are dead-set on Hidden Strings. If you were to go the invisible stalker route, *Whispering Madness* seems like a card that would fit your deck beautifully. If you have those Jaces, main board them immediately. A ten card mill is 1/6 of a deck. Mirko will probably not see much tournament play, but I love the card. The concept is beautiful for an mill deck.It looks like your sideboard has some counterspells. Syncopate is a counterspell card that is actively used in tournament play.I like the precinct six card. Consider mainboarding one more?if you have snapcasters, those would be nice too. You could combo them with mind sculpt and other mill instant and sorcerysIts competition:Dimir has its issues against reanimator. A true sideboard may need tormod's crypt.The other decks that may cause issues for you are naya blitz (aggro). Consider your bombs and mana curve! A few destroy 'target' creature cards may be importantI think it could perform against mid-range.
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What do you think now?
For clarification, this is a standard deck. While the cards you listed are nice, I wouldn't be able to play them.
What about Skaab Ruinators? Would that be worthless with the lack of creatures?