Generally I like the idea of letting people trade in cards to get other cards. On the surface it looks like a reasonable ratio to me. I would like to hear if @yabapmatt has any objections to this proposal, especially since its his job to make sure everything is in balance. Plus he would know the time it would take to create such a program.

I think this is a bold proposal and very creative. I'll be looking to what others have to say. Well done @imno, even if it doesn't pass then you've created the first real discussion on this topic.