Magic the Gathering Library and Graveyard Organizer

My wife and I like to play games of Magic the Gathering on our bed, so I needed a way to wrangle our library and graveyard piles so they wouldn't shift and slide around everywhere. I designed this to solve that issue. You might want one too! If you use it, post a picture.

The holder can hold up to a 75 card deck comfortably.
This holder doesn't work with sleeved cards. Sorry. I'll probably make another version that does.