This is my first build from ground up that doesn't suck at first sight.

https://pobb.in/ul9pfAXOtc7J

It's an affordable, simple Blight occultist. Blight is chaos which can't be reflected, resisted less and it being DoT means we are dealing damage even when dodging. Scaling its damage synergizes somewhat with scaling Profane Bloom damage for better clear.

As for the items:

1. The crown with this corrupt is ~30c currently, it was around 10c a month or two ago.
2. When searching for rares, I had a 10c max filter. Most are much less.
3. Our most expensive item is the Atziri shield but the build fully functions without, it's just a lot of defense. Of course, Aegis is even better and then you don't even need Iron Reflexes on your Skin Of The Lords, any Skin Of The Lords will do but I felt that's a bit too expensive for most of the league -- but by now it's affordable, too.
4. The boots have can't be chilled but again that's optional, you could pick "Cannot be chilled or frozen while casting a spell" from caster mastery, we have it available at Arcane Sanctuary. Then maybe think of the Stampede boots, annointed with Foresight it's not that much loss in ES and the movement speed boost is considerable. No need to worry about quicksilver running out etc. Just a thought.
5. As always, there are a lot of options for Watcher's. The only mod you need here is the block attack damage by determination, never mind the rest.
6. The best unique wand is Shade of Solaris and it's within the 10c range we want entire league. Compare whatever wand you can find to the DPS of that.

I am using a lvl3 empower and no awakened gems. I think the damage is real, not PoB warrior: either it's a long boss fight and then we have enough time to stack Wither or it's a non-boss and then they don't have chaos res. I added custom mods for Arcane Surge because PoB doesn't recognize it in Arcane Adept.

I tried to carefully set up Clarity level to make mana regen faster than channeling Blight depletes it. My math was simply Blight cost times cast rate, if this is wrong let me know.

The spectres are pure defense, the two Ancients are throwing Enfeeble and Temporal Chains and these spectres are special because they have their own curse limit.

You can put Molten Shell on left click and then this becomes a true one button build.

I have not added any flasks.

A further improvement:

Converting The Agnostic to [The Traitor](https://www.poewiki.net/wiki/The_Traitor_(keystone_passive)) and use only a Rumi's and The Wise Oak. This generates 24 charges over 10 seconds while The Wise Oak uses 25 over 10.20 seconds. You need to generate 1 charge over 10 second to keep it running so treating it as always up is not unreasonable at all. Since Brutal Restraint adds 20 dexterity to the assigned small skills in total, the path to the jewel socket added 10 strength and the flask provides more than enough ele res, we can drop Practical application and the small nodes around it, use a small intelligence node to connect the right side of our tree. This means only 1 additional skill point is needed. You want to hit "+8% increased of non-curse auras from your skills" on Faith And Steel and/or Sanctum Of Though for a nice little boost in everything (DPS, ES, armour). Now you need less resistance on gear and if you manage to make uncapped resistance all equal then you take 8% reduced damage for each.