The upcoming Norse mythology-inspired Magic: The Gathering set, Kaldheim will add new cards to The List, Wizards of the Coast announced today.
The List is made up of 300 cards from Magic's 27-year history, and they are found in Set Boosters, and appear in the final slot of the pack about 25% of the time. The List includes commons, uncommons, rares, and mythic rares, but being on The List does not make cards Standard-legal. The cards are legal in whatever formats they are already legal in. WotC plans to bring more cards to The List in every new set that might make sense with the themes of the set, but it will mostly stay intact from set to set.

Here are the additions to The List for Kaldheim:
It makes sense that Kaldheim will be adding a lot of snow-covered and ice-themed cards to The List.
Wizards introduced The List with the release of the Zendikar Rising, the first set to have a Set Booster. You can check out the full list of cards in The List here.
Related: MTG Reveals The 7 Heavy Metal Bands That Will Showcase Kaldheim Previews