Ball cards can be obtained from:
- Unlocking cases that you get for victories
- Play a game and claim a daily reward
- Getting a crown case
- Getting cases for completing missions
- Taking a free case in the Shop (with a chance)
- Purchasing in the shop
- Getting a case as a league reward
When you receive a ball card for the first time, that ball is unlocked. You can get its cards from any case, including cases from lower-level Alleys.
Your League adds a permanent bonus to the number of cards received from cases.