Hey !
I've been trying to think about that type of play with another format called "the Horde" (you can take a look here:
https://homebrewery.naturalcrit.com/share/2C5uPj7L0gMW if you don't know about it already)
I've struggled to make any good battle options for my group, so I think I'm gonna try your version instead. If you wanna share about it, like what kind of deck is forbidden or unplayable in this format ?
Thanks a lot for sharing though !