Why is my deck invalid in MTG Arena?
Did you accidentally include cards from a different set that's not allowed in your current format? MTG Arena is pretty strict about that.
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Your deck might be invalid in MTG Arena for a few reasons! First, check if you have the right number of cards - most formats require a minimum of 60. Also, make sure none of your cards are banned in the format you're playing. Lastly, double-check that all your cards are from sets that are currently legal in the format. Hope this helps!
Make sure you didn't mix up cards from your sideboard into your main deck. Happened to me once, and yep, deck was tagged as invalid. Easy fix though.
Most likely, you've got banned cards in there. MTG Arena updates its banned list often, so a card that was legal last week might not be this week. Always check the latest updates on the official Wizards of the Coast website.
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