Although not technically a Core 2021 product, Jumpstart boosters are still thematically tied to this set.
The idea behind Jumpstart boosters is that you mash two boosters together and you get a deck. Each booster has a specific theme. Therefore you can get some weird combinations like Cat-Goblins or Elves-Pirates.
Afterwards, you play against another player who did the same. So if you’re organizing a game night, you’ll need two packs per person.