I've been looking at Anomolous Mana Leech Support for a while. At 50 qual it gives 25% inc damage for each 200 mana spent. I think this indigon'ish mechanic is very cool, but attack builds usually don't spend a lot of mana if any at all.

So first of all i got rid of all auras exept determination. Defeneces took a big hit, but nothing i can do about it. I combined determination with eternal blessing support so it doesn't reserve mana and clarity(1lvl) with arrogance support just for watcher's eye.

For mana recovery i have mana recoup, its kinda no brainer. You hit yourself, you take damage, get some of that damage back as mana, simple. I have 20% recoup from passive tree, 17% from watcher's eye, 13% from rings.

Now that i have 1200~ unreserved mana, how do i spend so much? In order to spend a lot of mana i use elder helmet with 3 crafted supports. This helmet + cwdt (automation + high cost multiplier) + archmage + couple of spells = 900~ mana per cast.

At around 100+ stacks mana recovery rate meets spending rate and in couple of second ramping reach it highest, which in perfect conditions should be around 14k mana spent recently, but in POB i use 10k.

POB: https://pastebin.com/uwubx0FC

Little demo just to showcase mana spending/recovery: https://youtu.be/7esviIvM5hA

I've been delving lately, so here is a bit of it: https://youtu.be/bmdYna4a-9Y