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Enchant land Whenever enchanted land becomes tapped, its controller puts the top three cards of his or her library into his or her graveyard.
Diregraf Captain seems out of place with only a couple zombies in the deck. Crosstown Courier doesn't do enough in the realm of mill, Necrotic Ooze only has 6 valid target creatures in your deck and only about 4 of them are good... when you take into account that they have to actually be in your graveyard at the time it gets pretty inefficient if your opponents don't rely on activated abilities... Wonder is one of those cards that's so almost good... but most of the time your opponents will have a way to handle fliers and it won't matter. Try and upgrade Doom Blade to a Go for the Throat . Chronic Flooding only really works well if you get it really early game, and the game lasts a long time... I'd cut it. Same goes for Curse of the Bloody Tome . Nightveil Specter relies on you actually hitting them, and you still have to actually cast them if they're spells...
Cards to consider:
Removal: Sever the Bloodline It's a four cost, yes, but it's an exile solution in black, and it has flashback if you need it. Similarly Ashes to Ashes Sure you lose 5 life, but ideally the creatures you take out would hurt you a lot more than that. Diabolic Edict , Geth's Verdict .
Mill: Extractor Demon
Random utilities: Endrek Sahr, Master Breeder (tokens for sac costs or if all else fails swinging.) Reassembling Skeleton , Nether Traitor , Black Market is getting a little pricey, but it's good for what it does.
Lands: while I understand it's a fairly budget deck, there are a few lands you should probably be running, and a few more that are cheap and passable for EDH... Darkslick Shores , Dimir Aqueduct , Dreadship Reef , Drowned Catacomb , Jwar Isle Refuge , Tainted Isle , Temple of the False God , Terramorphic Expanse , Evolving Wilds and maybe even Esper Panorama and Grixis Panorama .
As badly as i want to run Doorkeeper I just cant seen to get enough use out of him. you might try to remove those fellows being that you already have 16 other creatures with defender to ramp with the guardian not to mention the colossus id would up the count on both colossus's to a minimum of 2x then use those other two slots for say Golgari Charm or counter magic or spot removal. As a matter of fact my very first FNM(about four months ago) i ran a mono blue defender mill deck that just about got me laughed out of the joint but Doorkeeper earned some respect when i had a few of their lands covered with Chronic Flooding as well.
Here's some stuff to consider: