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How to use crystals ingame.

Iff I heard correctly :

only use crystals on battle pass and on celebrations packs

Then you can use the credits to buy the single cards you need

I went from 1900 crystals to 4000 crystals(game update) - 600 crystals battle pass - 2x 1120 crystals for poke packs celebrations now I got back my 600 crystals for completion battle pass and with all daily rewards and leveling up I'm back at 3580 crystals

So atm the game is very fair to me