Card packs are reward bundles that contain multiple Collection cards. You earn them by playing events.

Card packs come in different colors depending on how many cards they contain:

- Common Pack: 2 cards
- Uncommon Pack: 3 cards
- Rare Pack: 4 cards
- Epic Pack: 6 cards with a higher chance of rarer cards
- Legendary Pack: 6 cards, with at least 1 new card

You can read more on how cards are distributed in packs here