right click: fire bats (dire bat rune)
1: spirit walk (jaunt rune)
2: soul harvest (siphon rune)
3: wall of zombies (unrelenting grip rune)
4: gargantuan (restless giant rune)
What I try to do is spirit walk into mobs soul harvest for stacks then put up the zombie wall and blast away with dire bats. when out of mana just spam your darts. The build is also good for surviving since you can run in with spirit walk and soul harvest and get a lot of life back. I'm looking for opinions on how to improve the build so feel free to give criticism.