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It's possible between matches, but not during a match.
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It's possible between matches, but not during a match.
But here we are talking about replacing a pair of cards, not replacing all 30.
Technically, there's no difference between replacing one card or 30. In this situation, I'm fine with any solution, as long as it's specific.
Org once responded to this topic, stating that since we don't publish a list of cards before the game, deck changes between matches are allowed without any problems. I think nothing has changed since then.