Are there any builds that would work with Doombringer?

not really. it does no damage. if you found it in a walkthrough then you could use it but on bnet its useless.

Eth Perfect Doombringer = 376-433 one handed damage with a free rune slot.

It has damage.

doombringer can't spawn ethereal

Doombringer , Grandfather,Hellslayer were actual weapons back in the days before patch 1.10
These days they dont worth !

not really, dmg is too low. in single player its good but in bnet u should allways use botd.

those were the great times, i remember dual wielding doombringers and using messersmidts reaver axe, and just facerolled anything back then, now they dont really do any dmg at all sadly.
compared to griefs/botds/deaths etc.