Hi, I've just been tinkering about with this list, some of the choices may look weird but I shall explain them and why I feel they are appropriate.
Mana Base:1 Black Lotus
1 Mox Jet
1 Mox Emerald
1 Mox Ruby
1 Mox Sapphire
1 Mox Pearl
1 Sol Ring
1 Strip Mine
4 Wasteland
4 Mishra's Workshop
5 Swamp
4 Polluted Delta
Creatures:3 Silent Arbiter
4 Dauthi Slayer
2 Dauthi Warlord
Disruption:4 Duress
4 Sphere of Resistance
1 Trinisphere
4 Tangle Wire
4 Sinkhole
Draw/Tutor:1 Vampiric Tutor
1 Demonic Tutor
4 Night's Whisper
Utility:3 Crucible of Worlds
Sideboard:3 Pithing Needle
4 Engineered Plague
4 Hymn to Tourach
2 Grim Tutor
2 Mind Peel
Right, so, card explanations:
Silent Arbiter - I have no other form of anti creature in the main deck, Arbiter is easy to hard cast using Workshop, and is very good at stopping creatures.
Dauthi Slayer/Warlord - No one plays with shadow creatures much so these are basically unblockable, I chose these 2 because they are cheap to play and in my opinion the best shadow creatures for their cost.
Night's Whisper - The deck needs card draw, other wise it just can't keep up once the disruption weakens, Night's Whisper is very cheap and gets you two cards for only two mana.
Crucible of Worlds - This + Strip Mine/Wasteland = gg
Engineered Plague - Stops Goblins and gets rid of Welder in Stax. Also helps kill Spirit tokens against Oath.
Hymn to Tourach/Mind Peel - This deck can't survive being countered early game, so against Mono Blue Control and Fish decks I need to put as much pressure on as fast as possible. I never seem to have much luck with Cabal Therapy, at the most I just get to see their hand, so Mind Peel seems a better choice.
I've only explained the less obvious choices, but if you would like explanations of anything else please just ask.
The Stax match up is pretty easy if I can get the pressure on early enough with Duress and Sinkhole, games 2 and 3 Pithing Needle and Engineered Plague stop them doing any annoyin Welder tricks.
Suicide Black can be taken care of fairly easily once I have Silent Arbiter out.
Combo decks are a walk in the park usually, especially if I'm on the play, Sphere and Wire help to set them behind quite a way, and I just beat down with the little shadows.
Control/Fish though is a major problem, turn 1 Force of Will can put me quite a bit behind, and if I can't keep the disruption going they will just counter out all my board gummers and eventually kill me off.
I haven't done much testing against Oath yet though so I'm not sure about it, I should imagine I lose horribly if they get Oath out though.

Any advice on the deck would be much appreciated, so far I've been considering Black Vise, Imperial Seal, Necropotence and Yawgmoth's Bargain. I haven't tested them yet though.
netherspirit