Hexing/Effigy is best if you have plague doctor1+ imo. Pandemic turns that tiny hexing aoe into a massive aoe for you to use.
Without it it’s rather sub par.
But Damballa is one of the strongest earlier dmg skills with a huge multiplier and base dmg, granted it’s a bit tricky to properly use since it needs zombies.
Krivis is no longer a recommended dps option either, it only works well if you pick up taoist later on imo. If you want zaibas for dmg you’ll need krivis3+taoist eventually.
Sadhu1 is a much better dmg filler now a days. Similar to default hexing/effigy, with less sp consumption and nice druid synergy.
A dievdruid is quite good though.
Just keep in mind druids will spend most their time transformed, and telepath does not work during transformations.
Why the oracle + kabba build though? for ein sof + counterspell in pve?