I'm aware there are unofficial solutions like XMage which is why I mentioned "official". As for handling priority, they really need something like the "auto" op

I'm aware there are unofficial solutions like XMage which is why I mentioned "official". As for handling priority, they really need something like the "auto" option from Master Duel where there is some rules engine that tries to figure out when you would want to hold priority. For example, I'll generally only want to tap a mana dork on my turn or if I have some instant speed ability/card in hand to use that mana. There are exceptions, but the auto system just needs to be good enough that I can anticipate how it'll work so I can turn it off as needed. Master Duel also has a cool feature where you can press down your mouse to always ask for a response if you know your opponent will do something soon that you care about.