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Dark Confidant is already worth playing in the current standard, this is what im playing and winning every week with.

Lands:
4 Watery Grave
4 Underground River
4 Island
10 Swamp

Creatures:
4 Dark Confidant
4 Hyppy
4 Dimir Cutpurse
4 Dimir Infiltrator
3 Moroii
3 Nezumi Shortfang
2 Nekkratal
1 Ink-Eyes

Spells:
4 Last Gasp
3 Persecute
2 Cruel Edict
2 Sickening Shoal

Of course:
2 Jittes (only two because having 4 infiltrators says i really have 6)

Sideboard:
4 Slay
4 Execute
3 Pithing Needle
2 Hideous Laughter
2 Distress

It rips glare, WW, and G/W weenie apart, it dominates greater good and heartbeat because of the massive amount of hand disruption so combo and control are no problem. When modified to your current metagame it owns. There's little to stop it right now. Its meant to beat aggro and control which are the dominant arch types in the current standard, it handles combo with 50/50 shot, if you draw some disruption you should be ok if not you're gona get owned.

First off what are you on?
Glare sucks against this, edict takes care of north tree and massive creature wipes ******** glare over, piting needle glare oh look it sucks.
White epic should never go off against this unless you're playing like a retard
Pyroclasm and wildfire hurt a bit but its nothing terrible devistating, Fires should have to fire out of desperation not for a win, again unless you're playing it like a retard.
Again WTF W/R weenie? How is it going to win when it has no creatures to attack? Yeah ok I dont either if it burns them but it has to waste two cards to burn off a moroii or take 2 from the char. Persecute destroys it since it has no backup after its hand is gone and it has no threats because its weenie, last gasp eats everything but paladin but that gets eaten by either jitte or edcit.
Arena is good for rock, confidant is better for aggro weenie. And what do you mean 'maybe more against MUC' what is MUC gona do? Nothing, they'll have to counter everything to stop me, the card advantage from the confidant and the card disadvantage they'll have from countering every threat, which is everything in the deck, says I win. Control cant stand up to this, the only control deck worth UB Aggro's time is the highly popular R/W control, but persecute eats that up to. It takes care of every tier one deck because it IS tier one, it won quite a few states because it wrecks 90% of the decks out there with everyone playing aggro.

Aside from our past argument I would like to give you some opions on the deck.....
In stead of Islands I would look into Oboro and Minamo... They are slightly better....
I would run a Mikokoro, for aditional draw just incase you need to draw a control spell.
I like Nekkratal as much as the next but I think You need to run the 4 cruel edict over it.....
The life loss in your deck is major so to off set this a mirin can be put in....
I think a Shizo over a swamp is one of the best things this deck can do...
Ink-eyes fear really hurts the opponent....
Finally, I think the Mororii's greatness ends at limited....
A Meloku in for it can Help the deck greatly... One more mana but the play of Meloku is better.... You can stall with mirin or swarm with flying tokens.....
I'm not telling you how to run your deck I'm just giving ideas on how to make it better....

Also Edited for arguments end....