Apparently it's a problem with the sideboard. Some of my decks have become invalid and some have not. I only kept 7 cards in the sidebard and these decks are now valid again. It seems to me a bug in identifying the cards on the side that belong only to BO3.
Apparently it's a problem with the sideboard. Some of my decks have become invalid and some have not. I only kept 7 cards in the sidebard and these decks are now valid again. It seems to me a bug in identifying the cards on the side that belong only to BO3.