Hearthpwn

For about 3 months, as a free player, I have been spending my coins on nothing but arena, and I found it annoying but rewarding. I saw myself as a better player in general, and I started to understand board pressure, value and tempo a whole lot more. I suggest the best way to get better at arena is to constantly play it, even when you don't feel like to and you feel like you are tilting. Forcing yourself to think value-wise and set up synergies is a great exercise for this game. Playing ranked all of the time would make you very nervous and make yourself invest into OP decks that come and go, which is not healthy for an average, casual player.