Was at the local Walmart and noticed something I hadn't before a few days back. There's the smaller booster pack size they carry that's 5 cards (with the added art/token and land), however, while looking at them I didn't see a rarity spread for them, anyone know what it is for them?

Basically, one of the card slots might contain a rare (or mythic), but it could also have a common, uncommon, or a foil card.

https://www.wizards.com/magic/magazine/article.aspx?x=mtg/daily/arcana/119