Build is not viable if you do not have every item slot at least ancient legendary. Many different tweaks may be necessary to make it optimal.
Not sure if the Obsidian Ring of the Zodiac can be used with Decrepify, need to test if that will lower the CD any if used in the cube. With all CDR being perfect you can get Land of the Dead down to a 30 second CD with 12 second duration without In-Geom, a 10 second In-Geom will turn it into 20 seconds CD. If you can get the Empowered Shrine for 10 min with the Cubed Gloves of Worship and Ahavarion, Spear of Lycander combo then you can potentially have Land of the Dead with 100% up-time. You use Bone armor, Thy Flesh Sustained rune to keep hurting yourself constantly to reduce the CD while at the same time reducing total damage done and having increased Life Per Second, you want as much Life per second as you get as with the Legendary Gem among other things.
Briggs' Wrath will help pull enemies towards you while you do an AoE radius around you, main source of damage is corpse explosion and bone armor while continously running. Spam devour and Corpse explosion while Land of the Dead is active, Aura of Frailty reduces total amount of damage needed to be done to enemies to 85%, Use Decrepify as much as you can to help reduce CDR and damage takenyou want to keep Aquila Armor and Dayntee's Binding buffs up as much as possible.