I played around with Avatar of Nature a lot back in Season 13 and discovered a bug that allows you to shapeshift while inside the Grizzly Bear duration, without losing its buffs (https://www.reddit.com/r/D4Druid/comments/1tq51jv/grizzly_rage_shapeshifter_dire_wolf_bear_storm_or/).
This bug is still happening, as shown in the video above. Currently playing around with a Landslider with the Shapeshifter aspect active (keeps all form bonuses), that benefits from the Wolf's attack speed, Bear's armor and Human's CD/resources all at once. Pretty useful as you can keep your Ifeh's Dire Totem buffs (125%x crit dmg, resource cost reduction) while keeping Bear form (Might of the Ursine, Survival Insticts). Not as powerful as the other bugs out there (macro, unique charms), but it is an interesting concept. Also a pretty good way to justify running that Shapeshifter rune meta.
Trying to use to better handle resources on my LS build, but it is still not as good as my other setups (doing pit 125 with it though). Thinking the old Shred + Boulders version will be better.
Since Avatar of Nature (storm+earth skills while on Grizzly Rage) was buffed, this is an interesting setup if you consider bugs/exploits. Done for theory crafting reasons and exploration only, play at your own risk (well, there are 10x more powerful bugs being used in all tower/pit runs, but anyway here is the disclosure).
(\) A much better and legit use of Avatar of Nature is the Omni Bear (https://www.reddit.com/r/D4Druid/comments/1toea9f/bear_omni_storm_grizzly_rage_might_of_the_ursine/), which we discovered back in Season 13 and has made its way to the top tower builds this season, so quite fun to see that progressing. Definetly my favorite build this season but still gearing up to some real pit pushing.*
Have fun.