Build Guide
This is a (new?) variation of the popular Helltooth Gargantuan Angry Chicken speed build.
I'm not sure if anyone else has done a Goldwrap version of this build but the point of it is to have damage immunity thanks to the gold drops caused by the Boon of the Hoarder gem. As long as you keep killing things and picking up gold, you'll be able to keep an up to 99.99% damage reduction buff from the Goldwrap belt! Not to mention with the primal ancient items you will do lots of damage with this build, to quickly farm T13 rifts. (How high you can go depends on your gear and paragon level, of course.)
Edit for 2.6.1: Still works great, the only thing to keep in mind if you had this full setup pre 2.6.1 is that Mask of Jeram and The Short Man's Finger were buffed, but only on fresh drops. If you're using them in the cube already you don't need to worry since they will have their new max values. If you have them equipped and lack any interchangable items you will need to find them again. (Reforge legendary doesn't work on the old versions either.)
If you feel like you're surviving well enough without Goldwrap, The Witching Hour is great to do even more damage. I added Cord of the Sherma to the list as well, since it's a good crowd control belt to use if you lack any of the other two or if you're playing a variant of this build in hardcore.
Never completely safe indeed since the armor bonus from Goldwrap does fall off from time to time. For HC I guess I'd go with vitality as the highest prio stat, Spirit vessel as 5th passive, and maybe change one of the gems to something more defensive like Esoteric Alteration. When I played WD on HC a couple seasons ago I used Cord of the Sherma as belt since it provided some great crowd control as well.