In this event you can get brand new chests in exchange of your duplicate cards!
It is possible to trade your duplicate cards for three types of chests. The specific combinations gives you a different rewards in form of spins, pet food, xp or cards.
Every card shows a number of stars at the top that show its actual value, and these numbers are added up when choosing which cards to trade for a brand new chest. It will automatically choose the lowest level and most common cards to trade, but this can be disabled by pressing on the “Select cards for me” box to allow for selection of cards to trade.
After a chest is traded for, a timer will appear which will lock the trade for another chest of the same type for a certain amount of time. You can skip this timer if you are using your coins to do so.
Keep in mind the card trade will not lower your game stars!