Commander Glossary
MMR stands for Matchmaking Rating, a number that estimates a player's (or a deck's) skill based on match outcomes, rising after wins and falling after losses. In Magic: The Gathering, some Commander tracking tools apply the same idea to individual decks rather than players, since playgroups often care more about which deck is strong than who's the better pilot.
MMR comes from competitive and ranked gaming, the same family of idea behind chess Elo ratings and the ranked ladders in games like League of Legends. The basic mechanism is simple: everyone starts at some baseline rating, it goes up when they win and down when they lose, and the size of the swing is usually weighted by the strength of the opponent. Beating someone with a much higher rating moves your number more than beating someone rated below you. Over enough games, the rating converges toward a reasonable estimate of actual skill.
Commander is a multiplayer, casual-first format, and most playgroups aren't trying to rank each other as players. The more interesting question at a kitchen table is usually "which of my decks is actually good?" So instead of (or alongside) rating players, some Commander tools apply an MMR-style rating to individual decks, using the same underlying logic: a deck's rating moves based on its wins and losses within the group.
Two real examples, and they take fairly different approaches. TurnZero HQ gives every deck its own Elo-style MMR, earned from real wins and losses and reported both globally and scoped to your own playgroup, so the number moves game by game with how the deck actually performs. Playgroup.gg goes further on the player side, running a full Elo-based rating system for players, plus a separate deck power-level estimate benchmarked across playgroups rather than within one. Both are useful; they're just built on different scopes of data and answer slightly different questions.
It's worth keeping the two ideas separate: player MMR/Elo rates the person playing, based on results across whatever decks they pilot. Deck rating rates the deck itself, independent of who's holding it. A tool can offer one, the other, or both, and they're not interchangeable. A strong player can still be a mediocre deck's record, and vice versa.
Every long-running Commander group has some version of the argument over which deck is actually the strongest at the table, and without data, it's just vibes and selective memory of the one game someone's combo deck lost. A deck rating built from real results settles that with actual win/loss history instead of anecdote.
Matchmaking Rating. It's a term from competitive gaming for a number that estimates how strong a player (or, in some MTG tools, a deck) is, based on match outcomes, going up after wins and down after losses.
They're closely related. Elo is a specific, well-known rating formula originally built for chess; MMR is the more general term used across competitive games, and many MMR systems are built on Elo or an Elo variant under the hood.
Not for casual Commander play. Wizards of the Coast doesn't run a matchmaking rating for kitchen-table or casual Commander games, so any MMR or deck rating you see in that context comes from a third-party tracking app, not an official Magic system.
TurnZero HQ gives every deck an Elo-style MMR from real wins and losses, globally and inside your playgroup.
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