I have never played the card game but did play the original computer game. When I saw the MTG arena I thought I would give it a go. I still have some trouble trying to figure out how some cards and decks work but playing helps solve that. With the ability to have so many decks and I am sure many with better knowledge than me have purpose built gimmick decks, I think there should be a win/loss tracker for your saved decks. You can hit a rut where you lose several games in a row where you can't get mana to cast anything or worse continue to draw just mana. But if your trying out a new deck a tracker should help you know how much you are winning/losing since you last updated a deck and your overall total for the deck. I think an option could even be included to not let a win or loss count if the match was not competitive enough (too little/ much mana; opponents not competitive or resigns) I think this would give the player more ability to fine tune decks and WOTC a way to track what's working online.