It boggles the mind that Forge has an archive of historic sanctioned formats as well as an elaborate and heavily customisable quest mode but no developer it seems ever slowed down enough to implement just a basic round-robin or swiss tournament mode. I mean I can play my opponents' sealed decks one by one but I want the game to numerically define how garbage my deckbuilding skills are afterwards or it's just not the same, you know?
Anyway, time for nitpicking GUI requests.
* In-match card overlays could use a darker background underneath them in the same style as the text-based counter display currently does. Reading numbers written partially on top of different numbers is not super legible.
* It would be nice if the windows with player information (hand size, floating mana etc.) were movable separately from their respective fields.
* Since each player's fields will generally be displaying two rows (land and creatures) for most of a match, I'd prefer an option for the cards in the field to always scale to a maximum vertical size of half the field. It just looks janky / inconsistent playing your first turn or when you remove an enemy creature and the land cards suddenly blow out to twice the usual zoom then shrink back down the following turn.
* When assigning trample damage to multiple blockers, the opposing creatures are represented by their card images and the opponent's life is represented by ... an empty black rectangle. I legitimately thought the game had bugged out when I first saw this. I'd suggest showing the opponent's avatar there instead for clarity.
* Hotkeys for the card picture and card detail tabs, please? With HQ scans and a 1200p monitor they're normally but not always redundant to show together, so.
* Group by CMC in the deck editor, please?
* Automatically hide the star rating filter in the deck editor for game modes that don't allow you to give cards a rating. Even clicking any part of that row (except the cross to close it) currently throws up java pointer errors when not in quest mode.