It's a very good strategy to collect as many soulbound cards as possible. Not only will you have better cards to choose from, you can actually develop your deck for the next level only with soulbound cards. I try to get as many of them as possible and if possible maximize them. There are pretty powerful cards among them in addition.
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Yes there are many powerful Soulbound cards. I hope I can get different cards every time I open a chest. Thanks for dropping by ang appreciating my content.