One of my all-time favorite builds is back baby!
At face value SR totems seem like an absolute meme, but I've been playing the build every other league or so since 3.15, and have a mildly successful build series about it on my YT channel from 3.16. It caught a solid nerf in subsequent leagues due to various changes, but with the latest change to Hierophant's Arcane Blessing ascendancy notable, and the curse changes from last league, it's absolutely back.
The general idea is to get 4 Scorching Ray totems and 9 Searing Bond totems through the use of Phantasmal Searing Bond, which grants an additional SB totem per 10 quality. With a 20 quality gem socketed into a +2 level of gems rolled Viridi's Veil, we can use Enhance 4 (boosted to 6) to get 60% quality on the gem, for a total of 7 additional totems, as the gem itself also adds +1 additional totems, plus 2 additional from Multiple Totems Support. With 4 SR Totems and 9 SB totems, we have 13 total totems, or 65% more damage from Hiero's Ritual of Awakening ascendancy notable.
The next step is to add in Hiero's new Arcane Blessing notable (which grants 20% more spell damage added to Arcane Surge) with the Arcane Capacitor wheel for a total of 60% increased Arcane Surge Effect, or 32% more damage. This can be boosted with an Arcane Heroism notable on a Large Spell Damage Cluster jewel, boosting the total to 38% more.
With this notable combined with 9 SB totems, we effectively gain 90% more damage over a baseline of not having the notable or stacking Searing Bond totems.
The build can be made a variety of ways, with varying degrees of investment and tankiness based on preference. Here is an example of a sort of semi-glass cannon version with mid/high investment adapted for 3.21 from my original build videos from 3.16:
https://pobb.in/L8iVdIvD6emu
With this setup I'm reaching the Dot Cap against Pinnacles, and about 16M dps against Ubers.
Feel free to fiddle around with it and make suggestions.