For example, in Woodland Chasm's Gatherer page, you can see the following:
I am pretty sure Woodland Chasm is not a basic land, for it is not among its types, but what that "rarity" tag means then? Why not just put "common"?
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Basic lands are a special case in a number of ways. While they're given the common set symbol, their rarity doesn't exactly correspond to “common” because of the way they're included in draft boosters: they almost always have a dedicated slot at the back of the booster, and not mixed in with other commons.
Woodland Chasm isn't a basic land, but it was included in the basic land slot for Kaldheim—hence it gets basic land's rarity, apparently!
They even have a unique rarity mark in the lower left of the card. If you look at the bottom left of cards since M15, they'll have a letter in the lower left explaining their rarity: M, R, U, or C—for Mythic, Rare, Uncommon, or Common respectively.
Basic lands meanwhile just have an L for Land:
Some sites like Scryfall opt to just call it “close enough” and file them as common, but Gatherer has opted to be more specific.
They have a special rarity other than common because they don't appear in the same places/frequency as regular commons in random packs like boosters. Instead, they appear as often as basic lands. From the Wizards website:
As always, Kaldheim comes in Draft Boosters. These are by far the best way to play any Limited format. This is the classic Magic booster, and the contents are pretty straightforward:
- 1 Rare or mythic rare
- 3 Uncommons
- 10 Commons
- 1 Snow land (basic or dual land)
- 1 Token/ad card
- 1 in 3 packs have 1 common card replaced by a foil card of any rarity