I'll post this again, because it needs to be said:
This build is abusing a bug. You need to know how to use the bug. You cannot just get 200 fcr and spam portals and expect it to work. That's not how this build works. Also, to all of the people who are building this character and playing it on your main account—There is a chance you can be BANNED on your account for this exploit. A pretty high chance actually, since this bug is expected to be patched any day now. People who play this build are aware of this. This is absolutely an exploit and unfair gameplay advantage. But possibly blizzard won't know every single person who abused it.
It all centers around the bportal. It is not my bug to share. That is up to deadgoddess or someone else and I doubt deadgoddess going to post it publicly.
All I can say is, if you get sling ring + fcr and maybe mess around a little, there is a chance you will discover it completely by accident. It's not a difficult bug to activate. It can be activated completely by accident just by messing around.
I had an “accident” reading this