In this event, you receive 1 free package of cards every 24 hours with various rewards.

 

This event also provides you with an extra opportunity to receive additional coins.
At the bottom of the event, you can see the "Collection" album.
Once you receive the collection element, it adds to the album, and after all parts are collected, you receive a huge reward.

 

 

After collecting all the characters, you receive a mega bonus.

 

 

Moreover, after every purchase, you receive a key that allows you to unlock additional cards and get more rewards for them. Just try it out!