I think a combo of firebats wd and pestilence necro would be good. not exactly meta but it should be good balance between fun and powerful. if any build uses unity just swap it for convention of elements.
I had the same issue. I just assigned blood rush to another button. it worked on my mouse right click but not the left click.
the best for what you asked
wd helltooth gargs is my favorite
a rogue/thief class focused on stealth and diversions.
A Shaman/Druid type.