1. Action Time Stamps. In the Games Page, I sometimes look at an old game wondering when the heck the last turn was taken. Could be weeks, or days. It would be nice if there was somewhere to put this info. Such as "Last action taken place on _____."
2. More developed game stats. I realize that some people may keep spreadsheets of their games, but honestly I am usually doing ten things at once when I play this game and can't be bothered to. It would be great if there was somewhere in the Settings Page, or perhaps a new page where you could see detailed stats. Such as "Tower Victories: ___; Destruction Victories:___; Favorite Deck: ____; Favorite Resource: ____; Favorite Keyword: ____; Fastest Victory: ____; Worst Loss: _____;" etc.
3. Career records. Similar to number 2, I think it would be neat know how I've done against an opponent lifetime. For instance, if I am looking at the top players on the Players page, it would tell me that I have a 12-4 record against Player A, but a terrible 0-16 against player B.
4. Player Notes. Again, this would probably be something that I can take care of myself, but if we could have player notes the same way as we have game notes, it would be very helpful to remember things. Examples: You've gone away for some time and can't remember who has been helpful/friendly to you; player X always starts a game then leaves before their first turn; player Y always plays holy decks, so don't use your undead cards against her. Stuff like that.