Rewards can be obtained from missions or arenas. In the latter ones your rank tier usually determines what rewards you will receive when the arena closes. Certain rewards can also be by selling cards to the Card Appraiser (NPC).
There are a couple of different kinds of rewards:
- Tickets - they can be found in the message tab Tickets in the main menu
- Boosters - after being obtained as a reward, they are immediately opened (if the games crashs, the cards are automatically added to the binder)
- special reward cards or even AA cards from certain Event Arenas