Hello, 

I was thinking it would be nice if you could track what you have sent in ongoing proposals somehow. For example, any card you put in a pending proposal would be set to reserved in your shop as well as in your requests. Then when you would go to make another proposal, those cards wouldn't show up so you know you aren't including the same cards across different proposals. 

It would also be really nice if the site automatically removed cards from your shop/requests once a proposal is accepted. It is sometimes a pain to remember whether I've taken a card out or not. 

Thanks!