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As far as I am aware, the rarity of Magic: The Gathering cards is determined by how many times a given card gets printed, relative to other cards in the same set. I believe the standard distribution is for every 120 cards, you get 1 mythic, 7 rare, 24 uncommon, and 88 common, with cards of a given rarity equally likely to appear. This, in turn, determines how likely you are to pull a given card from a randomized 15-card booster pack.

Commander cards aren't sold in booster packs. The only way to obtain them is to buy one of the pre-built Commander decks. These decks have fixed deck lists, so every deck you buy has the same 100 guaranteed cards in it.

However, the Commander cards do have different rarities. For example, the Commander 2016 card Army of the Damned is a mythic rare, while Windfall is an uncommon. These two cards both appear in the 2016 deck Entropic Uprising, and no others. In other words, when purchasing Commander decks, you will always get the same number of Army of the Damned as you do Windfall, but they are somehow different rarities.

In addition, the distribution of rarities in the deck is off as well. Again, using Entropic Uprising as an example, there are 5 mythic rare, 33 rare, 26 uncommon, 15 common, and 20 land.

How are these rarity levels determined if there is no randomness or normal distribution of cards in the set?

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You mention that each deck is a singleton deck, so each card is printed exactly as much as each other card within that product. This is true when considering just one deck, but if you look at multiple decks that are part of the same product (e.g. all of the C16 decks), cards at lower rarities are printed in more decks than cards at higher rarities. Common cards can be printed in 4 or 5 of the decks, while mythic rare cards are printed in only one of them.

Rarity also has some meaning other than the print run frequency in sealed products. In particular, the Magic Online format Pauper allows only cards that have been printed at common. Similarly, the unofficial format Peasant is similar, but has slightly less restrictive deckbuilding rules and allows some uncommons. So, we can assume that power level plays a role in determining the rarity at which a card should be printed.

In addition, Wizards' "New World Order" design philosophy, which has been in effect for several years, dictates that more complex cards should be printed at higher rarity levels. This is a less important consideration in decks of singletons, but it's likely that they continue to follow the same principles for consistency.

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  • I considered the idea that multiple printings affected rarity, which I'm sure plays a role, but as I mentioned, there are a number of cards that only appear in 1 deck but have different rarities. The idea that "rarity" is no longer just about scarcity, but also complexity, makes a lot of sense though.
    – KutuluMike
    Apr 18, 2017 at 22:18
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Both of the examples you mention (Windfall and Army of the Damned) were printed in other sets that were released in the booster format before being included in the preconstructed decks. At least these two examples preserve the rarity they were previously printed at (Windfall was uncommon in Urza's Saga and Army of the Damned was Mythic in Innistrad). Here, they are following the same convention they followed with the Duel Decks.

For new cards printed in these sets, such as Atraxa, Praetors' Voice, they are presumably given a rarity that would be appropriate in the event these cards are ever reprinted in a booster-pack format set. Granted, this is less likely given they aren't making core sets any more, but there is still MTGO, and some of these cards may make it into the main story line sets.

Loxodon Warhammer is a great example in that it has been printed at different rarities in different Commander sets, but was also printed at different rarities in booster pack sets (it was Uncommon in Mirrodin but Rare in 10th Edition). The assumption is that if they do reprint Loxodon Warhammer (such as in the as of yet unannounced Mirrodin 3 block!), it would be as an uncommon.

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  • I wouldn't necessarily say that you could infer anything from the rarity in sets like Commander to future block set releases. After all, those sets are individually designed and balanced, which presumably was the reason for changing Loxodon Warhammer's rarity for its 10th Edition printing in the first place. At the same time, it's possible that they use the latest rarity for the basis of their decision process. Apr 20, 2017 at 8:50
  • Warhammer at uncommon would be devastating in limited.
    – Neil Meyer
    Apr 20, 2017 at 15:13
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The rarity of a card determines how often it can appear in a booster pack, not the other way around. A card's rarity, in turn, is determined by the set designers according to the card's design and how often it is supposed to appear in its respective limited environment. That is why sometimes reprints of cards get a different rarity, to control their frequency in that block's limited environment, even though they're the exact same, mechanically.

Preconstructed decks, as you already noted, can in principle have any distribution of rarities. A precon deck is supposed to make thematic sense. In the case where cards are available only through those precon decks, the rarities don't matter at all, and their rarities can be freely assigned according to the (lack of) complexity of their design.

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    The first part of your answer seems like the same thing I'm saying in my question, or am I reading it wrong? As for the second part, that's really what I'm trying to find out: if the rarity "doesn't matter" and doesn't reflect "actual" rarity, why have them, and how are they determined?
    – KutuluMike
    Apr 18, 2017 at 21:45

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