I like what you've got going on where so far, and I like the design space you've opened up! I def think more factions like yours should be able to play around with crafted items, and even card play outside of your opponents turns!
I'm curious about their scoring potential, since I'd wanna see if they'd consistently be able to get the items they need to get a points engine that's competitive. I also feel the first step in birdsong is a bit wordy. Perhaps it could be shortened a bit and some edge cases lined out in a law of root!
Cheers and thank you!