Braids - very hard to cast, very hard to keep around. I am not surprised players have found problems with this card. She appears to be awesome, but is pretty much open to every counter and every creature kill out there.
First off, Hello!
I think you are right about Braids, Smokestack players have been searching for a similar ability for a long time now and have come up empty handed. 2BB isn't that great. It's not horrible mind you, just not optimal. We need another artifact with a similar ability.
I found a replacement in CULLING SCALES; which obviously is not as good as Smokestack, but its a LOT faster in its inception, and at least you get to start targeting; as well as pretty much not having to sacrifice your own permanents in many games.
I tried out Cullilng Scales. It's randomly
decent, and randomly horrible. You can't lay it down first or you just pop off your own moxen. It also has bad synergy with Chalice @ anything. Since most decks do(and should) run 4 chalice it doesn't work too well. I will say this, it's good againsts Fish decks. It takes out quite a few critters before it destroys itself.
I have even taken the steps to removing ALL off-colour Moxen (!!!) and putting in 4x Serum Powder after looking at the Manaless Ichorid Tech. This does help massively with mulligan consistency to get the right deal;
Since you are playing a Stax deck with artifacts, you really NEED to keep all the Moxen in. If you don't own them, thats acceptable. But trading out mox for Serum Powder sounds....well, bad. Not saying Serum Powder is bad, just that mox are
better any day of the week. Try taking something else out for Serum Powder.
Null Rod - Universally this appears to be found to be a useless card in playtesting (on all MUD and STAX Forum threads I have looked at). It does NOTHING against SolidarityHighTide, and doesnt seem to slow down the STORMing combo players all that much. I dont like to see it, and it's Chalice that is the deciding artifact, not Null Rod. - - - With NULL ROD out of the way, it opens up for MEMORY JAR and use of the SERUM POWDERS as mana sources
I can't agree with your opinion of Null Rod, especially the part about it not hurting storm combo that much. To the combo player useless Moxen = Bad. Yeah, you can't run both Powders and Memory Jar with Null Rod. But for 2 mana it's really a great hoser, don't underestimate it. Do you see a lot of HighTide decks in the UK?
I think most of the people who sufficiently tested out Black Stax have found that MonoRed(Uba) or 4/5c stax just work better. Hope any of that helps.
Mike