text: An extremely popular feature in the game is the ‘Card Collection’.[11] Players make tremendous efforts to collect and trade cards in hopes of completing card set ts, which are used to win sought-after rewards such as spins, pet experience and more. Chests with collectible cards inside them can also be collected using coins.[12]
  
  Cards differ in value, and some of the rarest ones can be very difficult to find. The most precious cards can be shown off to the player's communities.[10]
  
  There are countless online social groups of fans from all over the world that are dedicated purely to card trading.