Play at the Table
Open Play on a phone or tablet and you get a life counter for a game you're playing in person, with real cards. Put the device down in the middle of the table and everybody's numbers are on it, each one turned to face whoever sits there.
It's for two to four players. Before you start you pick how many, the starting life, and how people are sitting, and you can give each player a name, a colour and some art behind their total. The art can be one of your decks (it uses the cover art, framed the way you framed it) or any card you search for, which is handy for whatever commander your friend brought. All of that is remembered for next time, since it's usually the same people.
You don't pick who goes first. When the game starts, the panels light up one after another round the table, slowing down until one stays lit, and that player goes first. After that, whose turn it is is up to you. Hit rematch and it picks again.
Keeping Score
Tap the right side of your panel to gain a life and the left side to lose one (your left and right, since the panel faces you). Hold it down and it goes ten at a time. While you're tapping, a running total next to your life shows how much it's moved, so "take seven" is easy to check.
The buttons along the edge nearest you open the rest:
Commander damage has a counter for each opponent's commander (two if they have partners). Damage you put in there comes off your life as well, so you don't have to do it twice.
Counters has poison, energy, experience, rad and tickets, plus the city's blessing. Whatever you've got shows on your panel so the table can see it.
The menu is where you rename yourself, turn on Partner if you've got two commanders, or concede.
When the numbers say someone's out, their panel says so and why. If they've got something on the table that keeps them in, tap Still in and the tracker takes their word for it.
The Middle Button
The button in the middle is for the table rather than any one player: who's the monarch, who has the initiative, day or night, the storm count, and dice and a coin. It's also where Undo lives. It doesn't keep track of whose turn it is. You'll know that better than it would. A run of quick taps undoes as one step, so taking back "minus seven" is one press, not seven.
Where It Lives
Everything stays on the device you're using. Nothing is sent anywhere, there's no account involved in the game itself, and the screen stays awake while you're playing. Starting a game takes the whole screen, too (except on an iPhone, where Safari won't let a page do that). Leave, in red under the middle button, takes you back to the app. If you close it or the phone locks, opening Play again offers to pick up where you left off.
There's no game history yet, so when you start a new game the old one is gone. Saving results to your decks is something I'd like to add.