EURGH. I'm not real happy with any of the Druid sub or multiclasses thus far.
In terms of multiclass, there's nothing that really gels with the stock Animist. The thing I liked about Druid was it's big array of options and jack of all trades nature. Any multiclass restricts it's upper tier options in exchange for forcing a focus on one aspect of the druid, be it spellcasting or melee, weakens their spiritshift form, and locks it out of the highest level of Wildstrike ability.
The inability to cast Rejuvenation on a Fury relegates them to a DPS only class, removing a chunk of utility from it. Not to mention the fact that their unique shift has a 2-handed ranged weapon and grants bonus spell range, making it much more about spell slinging instead of tearing things up in melee. Livegiver's inability to Summon is a restriction I'd happily take on, but the addition of -5 power level on Rejuvenation spells after shifting kills it for me, since I prefer to open with a shift. Shifter would be right up my alley since I like to spend as much time in shift as possible - if not for the inability to cast while shifted. That puts some serious constraints on what you can do in combat - especially if you need to pump out a heal NOW. It also pretty much neuters the spell tailor made for shifted druids, Taste of the Hunt. I mean, I guess the heal on deshift is meant to compensate, but I really dislike the constraint.
I'm about to start over again. This time, either as a straight shifter or animist. It's a little frustrating, and I never felt this way about my chosen class in PoE 1.