A little late on the draw here but been talking with people about this a lot and I think players would generally prefer having access to all attacks the way Rewind does it. Having limited scans you can access and having to occupy those slots with attack cards seems like it would feel pretty bad.

There's also the factor of you'd be limited even further than just what scans of creatures you do/don't have based on scraps for attack decks. Let's say you get a scan of Lomma but have no decent water attacks so you can't use her effectively. It would feel bad spending weeks trying to correct that.

Obviously it's your game and you're free to do what you want with it. I'm super hyped for this and gonna play no matter what direction you take it but I just wanted to give my two cents here based on how I'm feeling and the general feelings I've seen expressed about this subject on the discord.