Hmm. On the one hand, I think the ability is sufficiently minor that it doesn't feel uniquely "druidy." Copying it doesn't diminish the class nearly as much as, say, stealing the entire wild shape mechanic. But on the other hand, I think you may be right about the magical poison bit. I'll go ahead and note that the ability only applies to natural poisons.
True, but I can only base my attempts to balance the class on my own experiences.Poison usage depends on the PCs and DM. Some people use it a lot, and some very little. I don't think how often it will be used should determine what the ability does.
Thanks for the catch.By the way, Shifting should be an Enhancement not an enchantment.