The bear card has never been a spell and has never been cast, so Glimpse of Nature ability doesnt trigger, Souls Attendants ability, however, does, because another creature has just entered the battlefield
The fact that Storms Wrath also hits planeswalkers isnt as important, as these rarely see play outside of dedicated planeswalker decks, but 4 damage will take a sizable chunk of their loyalty out from under them in those rare cases that it comes up, which is pretty nice incidental upside
The question remains whether dedicating your red deck slots to synergistic Goblins is the way to go over playing better, non-Goblin creatures
So, I guess Im saying that you should be prepared to listen to whining if you build this as a Commander
WUBRG: You may play target Elemental card from your graveyard without paying its mana cost
Instead I want to look at arguably the best draw cards in the pauper format, the blue ones that only cost a single