Each match played at Skyweaver (Ranked and Conquest modes) earns you some XP. As you gain XP, you level up and unlock Base cards for free. You will also unlock Starter Decks that will help you begin your journey with deck-building.
If you have Premium Skypass, you can unlock base cards even faster!
Base cards cannot be traded between players. However, Base cards can be played in the Discovery or Constructed game modes just like any Silver or Gold cards.