You will NOT be choked on flex slots for this build, it's very flexible.
Build Explained:
Buy early items in any order you want. I usually go for heals first but you have lots of sustain from leaping slash, much like scorn.
Core items I'd recommend buying in order.
Colossus and ES are nice items to have but if you really need an active counter or just have another active you prefer you can ignore those items.
Superior cooldown helps a lot with refresher and you can do loads of damage with leaping slash. Leech is amazing, especially after including healbane. Lifestrike is good, applies movement slow and more heals and damage but not super important.