I do think Dimir (with lucky pulls/correct picks) can be the dominant force in draft or sealed now...however, my opponent in the finals ran simic and splashed red for gruul, and he was a force to be reckoned with. My belief about Gatecrash at this time, is that if your cards aren't allowing for Dimir, that red/blue/green is obviously your second best option.

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This means Dimir has a bad promo, a bad Keyrune, an OK Guildmage, an OK Charm, horrible rares, horrible uncommons, and horrible commons! To top it all, pretty much all of the guild pack’s slots are filled with cipher cards, which are not very useful—you want mill cards and defensive cards, but those won’t be found in that pack. Unless I underrate cipher very much, I’d stay away from Dimir, because it doesn’t look like you’ll beat anything but the Orzhov decks.

I won my pre-release tournament last night with Dimir. I did get lucky on some of my pulls (Lazav, Lord of the Void) but Consuming Aberration actually was the hero of the deck-easily finishing off my opponent a couple of turns after playing him. Psychic strike also saved me a number of times while adding to the mill strategy nicely. the 2/3 vampire with flying is very handy, and if you attempt this strategy I attempt snagging a few of him, as well as pretty much any rogue in your colors. The one drop rogue is great early damage, the 1/2 blue faerie rogue is a great evasion damage source many people are overlooking, and the unblockable rogues...do I really have to explain that when you've got cipher?

Just think about your mill strategy as a burn strategy, except your opponent has 33 life to start and takes 1 damage per turn.

For any prerelease guild you should build a deck around the cards you get, not the guild. Your guild pack helps, but if your other packs don't support your guild then abandon it for one that works.

In sealed deck, and to a large extent in draft, millstone wins seem hard to pull off. Many of the capstone cards for this approach are rare, so I probably won't have them. (Milling is hard in general, and the format makes this kind of one-method-to-win focus inherently unreliable. To win on turn ten, I'd have to average milling 2.3 cards per turn - while defending myself.)

In the end, if you want to play the Dimir colors, I think the best alternative is an esper deck. You get the milling from Dimir and the defense from Orzhov. If this is your plan, then I think the Orzhov pack actually offers better cards for you—you lose the Dimir promo, which is better, but instead of useless cipher cards you get 1/4 defenders and regenerating Thrulls.

I got 3rd in a prerelease of 50-ish running dimir. I personally am a hardcore dimir player and love milling opponents, and I was disappointed that my draws did not support that. However, I pulled a lazav and an under city plague. I found that cipher is very underrated (I hated it until I used it, then I thought it was better) and that removal is needed for dimir because of its weaker creatures. Lazav didn't do me much good, I was playing silicon or dimir whenever I drew him, but death cult rouge is really good with cipher. There were numerous times when I stacked everything on him and ciphered my opponent away. I nearly always got my consuming aberration and the land milling is good because by the time he's out your opponents probably played 4-5 lands and might have 2-3 In their hand This was my deck; 1x realmwright 1x shadow alley denizen 1 dusk mantle guildmage 4x death cult rouge 2x bane alley broker 2x sage row denizen 1x lazav dimir mastermind 1x consuming abberation 1x paranoid delusions 3x psychic strike 2x midnight recovery 2x grisly spectacle 2x way of the thief 1x shadow slice 1x under city plague 3x dimir guild gate 9x island 5x swamp

A lot of people underestimate the milling power of Dimir. I played Dimir at the prerelease yesterday and milled hard (and likewise got milled myself vs. Dimir). With Consuming Aberration being the promo card for Dimir that means there is a great chance to mill, plus its power and toughness are decided by the amount being milled so it has great stopping power. Thanks to Stolen Identity cyphered onto a Deathcult Rogue I actually had two 17/17 Consuming Aberrations before winning a match. My opponent's removal simply couldn't keep up with another Consuming Aberration appearing each turn.

Again, you have to see what cards you get, and if you get enough of them, but if you get enough mind grind, Paranoid Delusions, and Psychic Strike, among other mill cards, you can actually mill your opponent pretty quick.

Looking through the non-rare spells with Cipher, most are two or 4-drops, with a few areas of effect. Most either generate card advantage (Last Thoughts) or fend for time (Hands of Binding, Voidwalk). With 18 uncommons I can hardly count on getting enough Call of the Nightwing to token flood the ciphers through, and that's the most aggressive card. (I don't feel Shadow Slice compares particularly well to a 5-drop creature in a sealed deck format.)

For the prerelease it is going to depend entirely on which cards you get. In general, I would say no, milling is not going to be a good primary strategy (but may be a decent secondary strategy - try to get lucky and mill out opponent's bombs, pump up the Consuming Aberration)

I don't think Gatecrash's milling is nearly as explosive as similar decks in Dark Ascension Limited. And Dimir creatures are by far the weakest of all the guilds; if you want to actually play a solid defense, you're likely to need Orzhov or Simic to help you stabilize (Dimir can work well with both those guilds because it offers them the missing component they need to be a control deck -- lots more removal for Simic, countermagic for Orzhov). If I'm mixing guilds like this, though, I'd much rather be trying to win off of cipher+extort than straight-up milling.

I plan on going dimir( pulls allowing) and possibly splashing white for extort, because if you cipher-cast a spell then you have plenty of mana left over for removal and all the extort you want, also, if you play mind grind with consuming abberition out it adds another land to the dig, so all the cars with that effect do it again, and also having more defense is a plus, managing to mill tenish land may not be as dificult as it seems

As with anything this depends on what you pull. Dimir could use more removal but don't underestimate some of the unblockable creatures combined with the cypher ability. Hands of Binding, Stolen Identity, and Voidwalk are all amazing.)

You only need to hit about 10 lands with the various mind grind like milling to mill them all the way(odds are they'll play the other 6-7)

I'm a habitual Dimir player. In Gatecrash, many Dimir cards are strongly themed towards their millstone strategy or generating card advantage.

Mostly I just don't think the power cards are there in any capacity. It feels like black in AVR -- you can get a reasonable deck going in draft if no one else is in your colors, but the card pool's pretty thin overall. Magic pro Paulo Vitor Damo da Rosa had this to say about Dimir in Sealed, for instance:

So, can the basic milling approach be made to work? And if not, where should I be going for the win? (And which splash colours would help me achieve it? That decision depends on my draws, obviously, but of the obvious white-splash Orzhov or green-splash Simic, what would you recommend?)

Boros got slaughtered at my event...infact I never played a boros opponent because they all fell to the losers bracket almost immediately. they simply don't have enough momentum to make use of battalion-especially with the multitude of affordable removal in this set.

While many Dimir creatures are rather nice for reasons of evasion or card advantage, I'll hardly win with a direct creature approach against Boros or Gruul.

Orzhov is deadly, no doubt about it, but if you are running black or white at all, I found a couple of extort creatures on your side of the board can balance the scales enough against an Orzhov opponent...enough so that you get them before they get you.

(EDIT: This question originally referred to the Gatecrash prerelease, but has been edited to be less time-dependant. The focus is primarily on sealed, but most answers are probably just as relevant to draft format; answers discussing the differences are particularly welcome.)

You have to remember that mind sculpt / sands of delirium was a very real limited paradigm in m13, and know some people who have succeeded with the axebane guardian / doorkeeper / gatecreeper vine / trestle troll plan.

I managed to go 3-0 with Dimir in the one draft event I've participated in. Some of it was luck, but I'll share what I learned:

What Dimir does have going for it is that a lot of the milling in this set is attached to other stuff -- the common Balustrade Spy is a feeble mill card but also gives you a 2/3 flyer for a reasonable cost, for instance. And you do have access to some repeatable milling, like the prerelease promo Consuming Aberration and lower-rarity carsd like Paranoid Delusions, Sage's Row Denizen, Undercity Informer, and Duskmantle Guildmage.