I always wanted https://untap.in/ (yeah, I built it) to feel like this... free-form, chill, a bit messy. Just moving cards around, making mistakes, fixing them together, like a real board game night.
But after 10 years of user feedback, it ended up somewhere else.
Still nice seeing someone else land closer to that original idea. Well done.
Might check out the site I built at cardtavern.com.