The interface is buggy.
Simple stuff — Some cards do not give you the option of priority when the rules state that you get to have it. Some cards also give you priority when there are no targets, forcing you to pass at every single step (ie Jolted Awake).

Less simple stuff — Other players that auto-concede are either disconnecting/disconnected or are running a trainer that force quits. Us legit players will have to sit through it when it gets stuck. These should NEVER turn out to be a "draw". Give the win to the person who showed up and didn't leave.

Hard for people to comprehend stuff — (I have done PvP game modding so don't try to troll or gaslight me, k?) Players are using trainers. The cards highlight white when the other players are looking at it, but only one "section" at a time can highlight at a time. When everything on their board flickers, or their deck skips, you can see that they're using a shuffle trainer, and you can tell they are randomizing their hand by clicking a menu option. It's why every turn they take is an extra 15-20 seconds from a "normal" turn. This is most apparent when they start to run down the timer and then you see their cards flicker 3 times, then they suddenly have a perfect response for everything, and typically they'll either win in the next 2 or 3 turns, or (rarely but I have seen it and, again, I won't be gaslighted) they'll attempt to cast a spell without paying its cost (probably an "untested" option on the trainer that comes with a warning) and they'll auto-concede.

I've seen this in about 20% of games I play. I am familiar with how scripting works (C++, Angelscript, etc.) and how mods can adjust data through a keypress interface. If you want to know more about how trainers work, GOOGLE THEM. It's VERY EASY to find out what they are. MTGA trainers are not public, because (in case you didn't know) there are locked forums that post links to download things via dark web. I have been in PvP clans before and saw these firsthand, and it's absolutely not a new thing. Even within the locked forums you have to reply with a "Thank you" or upvote their post in order to see their links.

Now that I've explained for the greener folks, I should assume that some the ones who do know also work for the digital game team, and are probably instructed to deny and ignore, because while people are using trainers to win (this is highly likely, so let's just accept that it's worth looking into), they may not be using it to get certain store items for free. Perhaps they're still paying real world money, and I think that's the only reason the dev team is pretending it's not a real issue.

Problem is, your less enfranchised players take up the majority of your customer base. We're the ones who have to constantly put up with losing to people who are probably as abusive and disrespectful in real life (another story; bullying is just wrong) because we simply don't do microtransactions.

This company has to get it together if they want the game to last a while. Some of us who are very capable of collectively impacting things are really starting to get fed up, and I, for one, hate that I even have to think that way.

Maybe do something.