This is a fun and flavorful description, and I think it's a useful tool to spice up combat dialogue, especially for new DMs, or for DMs who have been playing a campaign for a while and want to bring the magic back.
An excellent druid circle with a wonderful flavoring. One of my players is definitely using this character in my campaign and I will give feedback as that goes. I have a few comments, however; would the expanded spell list work better as a circle spell table, or do you not wish for these spells to be always available like the other circle spells are?
This is a perfect product in that it fills in the gaps that a GM might miss or may not have time to prepare for if they get put on the spot. Further, I appreciate the design notes, allowing GMs to know what the philosophy behind the design was and how to modify it.