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Disenchant Extra Cards Not Part of Collection
From the patch notes: You will no longer be able to disenchant extra copies of cards that are not part of your collection.
What does this mean? Could you disenchant cards that are not part of your collection before?
Ben Brode
There is a rare edge case where your collection will show you have an extra copy of a card that you don't actually have. When players tried to disenchant that extra copy, it would dust the copy that they actually wanted to keep. We've added some protection against this. Sorry for the confusing patch note!