From the publisher:

This is the classic Magic booster, and the contents are pretty straightforward. Each of the 36 packs contains:

• • 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

It's also possible that one or more of these cards has been replaced by a showcase or borderless card, exciting alternate versions of Kaldheim cards.