@meadbert- what's your current list like? Since we are reaching our "tipping point," do you plan on making any changes or taking a break from Ichorid?
4 City Of Brass
3 Gemstone Mine
4 Bazaar Of Baghdad
4 Serum Powder
4 Chalice Of The Void
4 Leyline Of The Void
4 Bridge From Below
3 Sadistic Hypnotist
4 Ichorid
4 Stinkweed Imp
4 Golgari Thug
3 Dread Return
4 Cabal Therapy
3 Fatestitcher
4 Narcomoeba
4 Golgari Grave-Troll
sideboard
1 Gemstone Mine
4 Unmask
2 Darkblast
4 Chain Of Vapor
4 Emerald Charm
That is the list I am currently running and would play today.
Leyline is still crucial for the mirror and pretty much every deck either uses their yard or creatures.
A 12th land is suboptimal as too many hands end up with 3 lands. Also with 3 Fatestitchers you almost always dredge into one.
When I tested with 2x Dread Return and 2xHypnotist I frequently found I was missing 1 or the other.
I would like to make a few comments regarding the tournament report. First of all, I almost always board out my Dread Return targets and in fact I frequently board down to 1 Dread Return. The 1 Dread Return is important for dodging Extirpate on Bridge from Below. I board out targets because Grave-Troll is already pretty good and games post board are more about playing through hate than going broken first.
Although Hypnotist was criticized, its only purpose is to win game 1. Post board I board it out. I notice that all game 1s were won except for the game where Dredge mulled to oblivion. Therefore, I claim that Hypnotist did its job. When evaluating Dredge Return targets it is important to keep track of games where you Dread Returned (or at least could have) but lost anyway. These games are fairly rare. Although I am currently pushing Hypnotist, and I am pretty confident that it is the best target, I cannot say that the right solution is to run 3xHypnotist. Perhaps 2xHypnotist and Ancestor's Chosen would be the better solution.
Also, I could still see putting Darkblast back in the main deck now there are 7 on color sources. My perception is that Welder is not common enough to justify that, but if you find yourself in a Stax/Slaver heavy meta then maindeck Darkblast could make sense.
How exactly would you board against certain archetypes like:
Tez
Storm
Painter
Stax