Honestly whenever a WS-er plays in a game, or any other ability that grants t3+ status alone, its only fair/good form to ask the DM how much he's okay with. "One lump or two?"
In my case, I purposely limit myself to a handful of forms. Like 1 traveling, 1 tanking and 1 DPSing with maybe one funny utility form. That way a DM knows the 4 options available and doesn't get totally blindsided when you try to turn into a force dragon versus his magic missile wandificer.
The way we usually play it, you can only turn into things that you've personally met.
Starting as a Druid at level 1 buys you access to all the animals common to your background region. So e.g. an Eberron Halfling might have access to a bunch of plains-dwelling dinosaurs, but most characters would not.
Similarly, access to an Epic dragon would not be possible until the PCs met one in the game. This puts the DM notionally in charge of which forms a shape-changer can emulate.
Taking a Totem Druid is already kinda self-nerfing, at least past level 5 -- or even below, if you don't pick an optimal Totem -- so I wouldn't feel too guilty about taking this class variant.
Finally, of course everything is up to DM scrutiny, but there are plenty of DMs who want to know what the rules actually say before amending the rules. That's what I'm trying to lay out here -- what the rules actually say, and what they mean in practice. Knowing is half the battle, and stuff.
hmm Totem druid 2 gets Natural spell already ?!
That's sweet very sweet.
Arcane Hierophant beckons, loudly.
Divine Minion of Nephthys gets 3 different forms, still with the LA+1.
Yeah, Totem Druid gets free Natural Spell at level 2.
It's a pretty fun class variant.
It needs a bit of help transitioning to Epic, though.