Rarity denotes the value of a card. Cards are divided into Common, Uncommon, Rare, Epic or Legendary classes. The more valuable a card is, typically the more difficult it is to obtain.
Common cards are the most common type in the game. These cards can be obtained through most purchased packs. They are denoted by the card's name having a grey font.
Uncommon cards are the next highest rarity value after Common. These cards can only be obtained by purchasing Silver Packs and above, or by Crafting. They are denoted by the card's name having a green font.
Rare cards are the next highest rarity value after Uncommon. These cards can only be obtained by purchasing Gold Packs and above, or by Crafting. They are denoted by the card's name having a purple font.
Epic cards are the next highest rarity value after Rare. They can only be obtained through Mystery, Diamond, Promo, Platinum, and Draft Packs, or by Crafting. They are denoted by the card's name having an orange font.
Legendary cards are the next highest rarity value after Epic and are the highest rarity in the game. Legendary cards are the most difficult to obtain, and can be obtained through Mystery, Diamond, Promo, and Draft Packs, or by Crafting. They are denoted by the card's name having a red font.