Lumi staff is very worth while once you can start using it. It doesn't make or break anything but its a mana-free AOE nuke so you can finish off mobs and stuff without wasting mana. If you're quadding you work it into a rotation with your regular AOE dd spell to minimize the cast time. Its a nice item.
lumi staff plus
https://wiki.project1999.com/Elder_S...%27s_Vambraces makes you a lot more efficient in a bunch of different scenarios
ES Vambs are way better than the lumi staff for me, but I did a lot of root rotting so the extra free DOT helped efficiency a lot vs wasting an extra mana consuming DOT
edit- i looked up the GGR (goblin ring) and i never used the ivu ring with my druid so how to abuse such a ring would be new territory for me, so no comments there.