I remember playing Suicide Black for a long time in both Legacy and T1 some years ago. Once you get the hang of it you can get some pretty nasty stuff going. Its main advantage is that it keeps any form of Blue Control at bay effectively.
A good start is the old primer you can find here:
http://www.themanadrain.com/index.php?topic=11797.0It is a bit outdated maybe, but it still makes a lot of good basic points about the deck philosophy, what to play, what not to play etc. I'll try not to go over anything that's in there, so read it and learn it inside out.
By definition, with Sui Black you're throwing everything and their brother at your opponent, causing you to run out of cards in hand quickly. From what I see you don't have any of the old mana-funnel staples like Masticore and Nantuko Shade. The former nowadays may not be as effective besides low cost to P/T ratio and the occasional ping, but the latter is key. It'll win you many a games if you manage to keep your opponent with little to nothing in play, which is the basic MO of this deck.
As for single cards, I pretty much agree with everything smasher said, with a strong emphasis on 3x Null Rod and no Sol Ring, cutting the Lakes and Glaciers, and upping the fetches. I disagree, however, when he suggests cutting Hymn. I'd rather cut Duress for Seize than run both and not Hymn. Starting with Ritual -> Duress/Seize -> Hymn is way too good to pass up, I've had people scoop on Turn 1 thanks to that play. Another card you should strongly consider is Contagion. I'd play that any day over Edicts. Being able to target AND being a pitch spell make it really, really good. Did I mention it also gives you TWO counters to tack on?
I'm not sure what you're trying to do with a singleton Tendrils, you don't have much of a Storm shell in there. I'd much rather cut that for the fourth Negator which you desperately need.
Finally, I've always had mixed feelings about Confidant in Sui Black. The card is great, no doubt, but it's fragile and a mild threat compared to everything else you're playing. This deck wants to lay the beatdown from the get-go. I know it's a personal choice but I'd play Flesh Reaver before D'Conf. Compare:
Ritual -> Duress/Seize -> Confidant
with
Ritual -> Duress/Seize -> Flesh Reaver
If your meta is split between Tezz and Elves, then I'd say run one main and side in the other accordingly... But I'd run Reaver main. One thing I'm not sure about is if under the new rules you can win even if the loss of life would bring you to 0. If you can't, then I guess Reaver lost a whole lot of appeal and you shouldn't listen to my advice. But honestly, do not underestimate the Reaver. It's some nasty stuff.