Nice changes!
So much for cheesy massed long-range enslave mind using groups of nymphs during battle.
I will practically never use 5 nature gems to get 12 wolves. Compare to Call of the Wild, which I think is a bit pricey at 15N for 20 wolves and a werewolf who can summon infinite wolves at 3 wolves per month. Wolves are not very strong units - they have their uses but I think I would only tend to sometimes choose to use the new wolf pack spell if it cost 1 N or maybe 2N.