you recently added a category in summoners rift where you can check if you have already got a chest for a certain champion. It would be nice if you guys could implement the same feature for ARAM. In ARAM you can easily earn a chest. However you can't specifically choose a champion. So you will never know if it's worth tryharding for S-rank. If you manage to get a S-rank it's a big disappointment when you realized that you have already got a chest for that champ.
I mean it's no big deal adding this feature but it makes the game more player-friendly