PoB: https://pastebin.com/hPNeAvgz
Profile: https://poe-profile.info/profile/sucinum?realm=pc

This is my single char from Ritual which helped me doing everything (40 challenges etc). Put all my currency in it, but have no clue how much that was (maybe 150-200 Ex) and if I spent it well.

I crafted all the gear by myself, but won't go too deep into that, since I did a lot of mistakes and the Harvest changes will render some of it useless. Just one recipe, which should work in future:
Buy a rune dagger (or any weapon) with incursion cast speed and spell damage, clear other prefixes, craft "cannot roll attack mods", harvest craft 2* add phys for guaranteed "gain physical as extra chaos damage" and +1 physical spell skills. Don't use an influenced one like I did since that can screw it up like I experienced (rare combination anyways).

Some concepts:

Why Raider? It's nice to have Frenzy and Onslaught for free and also the opportunity to max Dodge without Vaal Grace. The starting position basically leads to a crit spellcaster, since you will cross the Assassin area. There is also an esy option to convert to cold damage (Winter Spirit), which was my first idea (hence the char name). If you convert all damage to elemental, Avatar of the Veil will probably be the better choice than ... Chase. But you can also add exposure via the trigger weapon.

Mana sustain: it requires the chest craft to have a large enough ES pool, also map mods with reduced ES gain will hurt (but not wreck everything), but on the other side allows you to reserve all you mana. I used an Enduring Mana Flask (and no Herald) until that worked.

Life sustain: there are other options for life leech, but the Watcher's Eye was the easiest one. Also life gain on spell hit is really great, I added to that with the crafted ring.

Trigger spells: since BF/BB requires 2 casts anyways, that seemed a very easy way to distribute a curse and also throw around some extra blades to explode.

Other defenses: going for Evasion probably wasn't the best idea and I ended up with a quite low value. Since even 7k life isn't plenty without damage reduction, I made the questionable choice to use Whirling Blades with Fortify Support (attack speed is quite nice as Raider). I died only like 350-400 times, had worse characters ;-)

Getting dps: since the tree doesn't have too much increased spell/physical damage, it's important to add to that on items. That's why I crafted this shield and use Mark of the Shaper. Cast speed isn't as important since you already have a lot of it. Unholy Might (crit cluster jewel) is great.

Feel free to ask questions or improve on the concept.