How to use TurnZero HQ
Every Commander deck is really a sequence of decks wearing the same name. Version history records each of them: what went in, what came out, and which week it happened, so a deck that used to win is a thing you can go and look at.
Everyone who has played Commander for a while has had this conversation with themselves. The deck was good. It is not good now. Somewhere in the last four months you changed maybe thirty cards, one or two at a time, each of them for a reason that made sense at the time, and there is no way to look at any of it. The current list is all you have, and the current list is the problem, not the evidence.
A decklist is a snapshot. What you need is the history, because the useful question is not "what is in this deck" but "what did I do to it, and when did it stop working".
A day's building is recorded as a version, with the exact cards added and removed. Not a diff you have to reconstruct, and not a timestamp with nothing attached to it: the cards themselves, on both sides of the change.
Grouping by session rather than by edit is the choice that makes the history readable. Nobody thinks in individual swaps. They think "the week I tried to make it faster", which was eleven cards in one sitting, and that is the unit the history keeps.
Every deck carries a rating that moves with each game it plays, globally and within a playgroup, charted over time. Left alone, that rating would have a problem: a deck rebuilt from the ground up would still be dragging around the record of the deck it used to be, and its number would be describing something that no longer exists.
So the rating splits by version. A substantial rebuild starts clean, and version history is what gives that split its meaning, because it says exactly what the new version is. Between the two, "did that change help" stops being a feeling about the last three games and becomes a line on a chart with a list of cards beside it. How Deck MMR works →
Cutting a card should not destroy it. Cards taken out of a deck can be set aside on its bench, and cards you want for it sit on a wishlist next to them. The card you cut in March is right there in June when the deck turns out to have needed it after all, and the card you are saving up for is written down rather than remembered. How to decide what to cut →
Version history tells you what you changed. The other half of the question is what those cards then did, and the Deck Lab's advice panel answers it with concrete cuts and adds, each carrying the evidence that produced it. Inside the Deck Lab →
Some of that evidence comes from the games themselves. Board state photos taken while playing a deck feed its cut-and-add list, so the app can point at cards that never actually made it onto the table. No decklist analysis can produce that, because it is not a fact about the list. It is a fact about your games with it. Board state photos →
Anyone tuning one deck over months rather than building a new one every week
Players who want to know whether the last rebuild actually worked
People who keep cutting a card, missing it, and forgetting what it was
Playgroups where "this deck got a lot better" is a claim somebody will want checked
A day's building. The cards you added and cut in one sitting are recorded together as one version rather than as a hundred separate edits, because the unit people actually think in is the change they made, not the individual swap.
The exact cards added and removed. A version you can only see the date of tells you nothing; the point of the record is being able to look at the eleven cards that went in the week the deck stopped winning.
Deck MMR splits by version, so a substantial rebuild starts on a clean slate rather than dragging around the record of a deck that no longer exists. Version history is what makes that split meaningful: it says what the new version actually is.
To the bench, if you want them there. Cards set aside from a deck are kept rather than deleted, and cards you want for it live on a wishlist beside them. The card you cut in March is findable in June when it turns out you were wrong.
Board state photos taken during games with a deck feed its cut-and-add advice, so the Deck Lab can point at cards that never actually hit the table. That is the one thing a decklist genuinely cannot tell you, and it comes from your own games rather than from aggregate data.
Every day's building recorded with the exact cards in and out, and a rating that starts clean on a rebuild. Free to start.
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