Have a list, off to the side, of who is editing the deck along with you, and if you are the deck owner, allow you to kick them from the session. Here's basically what I'm going for (I did this in Paint.net lol): 
Have a list, off to the side, of who is editing the deck along with you, and if you are the deck owner, allow you to kick them from the session.
Here's basically what I'm going for (I did this in Paint.net lol):