Here is a very powerful base that you can get going with a relatively small budget. So far the two skills I have tried with this build are flicker strike and frenzy of onslaught. The build is extremely tanky and damage is very good. All ubers cleared with ease.

It takes advantage of the cheap unique trifecta badge, ralakesh, and malachais loop. Usually builds have trouble getting tanky with this combo but we stack energy shield per power charge from the eternal timeless jewel and various high es bases.

Here are four pob's for different levels of the build. I added quite a few tips in the notes section so please check that out if you are interested in mechanics and item choices.

entry level

https://pobb.in/63quDUY6Dk1V

mid tier

https://pobb.in/Glw6ywA8raAX

big budget (mageblood etc)

https://pobb.in/Ry9Pm8MMtyTi

giga budget (mageblood and og sin etc)

https://pobb.in/fFKbL5nQZuQa\

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Other Video Demonstrations

face tank invitations with graven's secret

https://youtu.be/VWHtoIsjTMo

flicker strike - uber cortex

https://youtu.be/Rz3sOjNioA0

(edit formatting)