Its keeping a powerful and staple mythic cheaper than it otherwise would be
That might be Luminarch Aspirant or Innkeeper's Talent just spicing up your Cube deck with some extra power, or it could be a dedicated build-around seeking to exploit Winding Constrictor and Ezuri, Claw of Progress
Description Every Kaldheim Collector Booster pack contains 15 cards and 1 foil token, including 5 foil Commons or Snow Dual Lands, 2 Foil Uncommons, 1 Foil Snow Basic Land, 1 Rare Saga or special Rare or Mythic Rare not found in Kaldheim Draft Boosters, 1 Extended-Art Rare or Mythic Rare, 1 Foil Rare or Mythic Rare (Single or Double-Faced), 1 Non-foil Showcase Uncommon, 1 Non-foil Showcase or Borderless Rare or Mythic Rare (Single or Double-Faced), 1 Foil Showcase Uncommon, and 1 Foil Alternate-Frame Rare or Mythic Rare (Single or Double-Faced-Showcase, Borderless, or Extended-Art).
Thats a very powerful mechanic, especially to noncreature-based decks that are particularly weak to parity being broken in that way
Azurite Sea Starter Deck Amber & Ruby This starter deck is very thematic: you play a bunch of pirates and send them off to locations to win, essentially searching for treasure