historic invalid decks will not let you remove cards marked red (invalid) from the deck
When opening historic decks with invalid cards marked red, you cannot remove the cards from the deck for some reason.
6
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Timmy,PowerGamer#21039 commented
Same thing happening here. If I hit the "+" button it will add a new copy of the card, but pressing "-" will do nothing.
Upon returning to the deck selection screen prior to playing a game, the deck is still listed in the "Invalid Decks:" section, but it no longer says how many cards are invalid within it. Still can't play it though.