I just wish you could discard chests. Like when I'm stuck between the 3rd and 4th arena because I get almost enough trophies to move into the 4th but for some reason the game still pits me against people that are in the 4th and have the cards from that arena that I can't even use. Even if I manage to win one of those, I don't get a chest because I'm always full of chests from the 3rd because I was working my way up.
I mean, I guess with time that'll balance out as I upgrade stuff, but for now it's a pain lol