I thought they were done with missions like this since plenty of players had expressed their frustration with it. But no they must think they can get away with it since they're selling these legendary items at lower ranks now. 

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I meann they took away the part where you have to pay to complete it but they just need to make basic events completable without the need to pay, get cards (something that takes dumb luck , a-coin or money ) or use a-coin to complete and find a way to greatly reduce bots in maches if they can do these 2 things in my opinion the game would then be pirfict

We're still working on the quests. It's going to take some time, but we hope to make it balanced in the future. Thanks for your feedback, it helps!