I didn't play this game for a while, so I have very low crystals and all the battle needs battlepass and i cant buy it because i have very low crystals and i cant earn the crystals
Hi, this is because in the few updates that have happened a new feature was introduced called matchmaking.
If you are in the battle list, there should be a big green button called "Match Making". Click on it and then click on the mode you want to play on. Screenshot example:
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