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It depends on your progression and how highly you personally value 6* shards. For me I have almost all 6 stars in the game and for the most part opening them doesn't matter that much aside from iso and 7* shards. But for you, you might not have alot and might be hunting for a certain champ
If abs-man is your top champ then maybe yes. But if you do story quest and battlegrounds when you unlock it you'll be able to get 6* more frequently and then better use your units for masteries
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Is it valuable for me??