MTG Arena Bugs & Product Suggestions
This page is for reporting bugs and submitting product suggestions. If you are experiencing issues with your account, with an order, or otherwise need customer support, please click here.
How to report a bug
1. Give us the steps to reproduce the bug
2. Note which platform you’re using (PC, Steam, Mac, Android, or iOS)
3. Enter the actual results you’re experiencing
4. Enter the expected results of the feature
5. Add any relevant screenshots/videos
6. If you found a workaround, please add workaround steps.
Examples of bugs: Incorrect rules interactions, wrong event rewards, issues with client functions like creating decks
How to submit product suggestions
- Select “Product Suggestion” as the Category for your suggestion
- Enter your feedback
- Add any relevant screenshots/videos
Examples of product suggestions: Feedback on visual effects, recommendations for user interface improvements, new feature requests
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3350 results found
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Improperly Invalidated Decks
I have five decks listed as invalid, but none of them have invalid cards. It literally says Invalid Cards: 0
8 votes -
Invalid Decks & Sideboards
Decks that were previously valid a few hours ago are now invalid with red mark showing " 0 invalid cards" if I go into edit the deck (which is fine) it was say sideboard can't have more than 15 cards even though it's 15 or less. I'm on GeforceNow
16 votes -
BO1 format decks with 15 sideboard cards treated as invalid decks.
- After the update on 7/9/2025, some BO1 format decks with 15 sideboard cards display the message "Invalid Cards: 0"
- These decks can no longer be selected as decks to use in BO1 format
- Before this update, BO3 decks could also be used in BO1.
- From now on, if you want to use the same deck in both BO3 and BO1, you will have to clone it and reduce sideboard cards in BO1 deck, which is a pain.
- Roll back this change immediately.
- If this is not okay, why does the sideboard display have a separator that…
8 votes -
Invalid decks?
Some decks with sideboards are now invalid? It says decks cannot have more than 15 cards in sideboard, not more than 8 shown? Why is deck now invalid?
27 votes -
Invalid sideboard
Almost all of my decks are now invalid and unplayable because of an invalid sideboard error. No banned cards, or more than 15 cards in the sideboard. I can't even edit and save them because of the continuous sideboard error message.
25 votes -
Invalid deck
Deck says invalid even though I have the required cards for the standard format
40 votes -
Decks Invalid
All my decks are invalid for the format Im trying to play (For example, Pioneer). When I try to check why this is happening, is because there is an error with the Sideboard.
It keeps telling me that I have more than 15 cards on my sideboard, even with 0 cards on it.4 votes -
Sideboard invalid after 7 cards... decks now unplayable due to being invalid after having more than 7 cards in sideboard. over a week bugged
My Deck is invalid when sideboard is over 7 cards. Used to be able to play standard with 15 card sideboard, now anything over 7 makes decks invalid. So most of my decks are now unplayable due to not having any proper sideboard.
5 votes -
Invalid Sideboard Error When Deck Has 15 Cards
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Steps to reproduce the bug:
Open MTG Arena on PC and create a new deck.
Add your mainboard cards as normal.
Add exactly 15 cards to the sideboard.
Attempt to save the deck.
Platform:
PC-
Actual results:
The client displays an error message:“Invalid deck: can't have more than 15 cards in a sideboard,”
even though there are only 15 cards in the sideboard. It prevents saving the deck. Expected results:
The deck should be valid and save successfully with 15 cards in the sideboard, as this is the maximum legal amount.Workaround:
Reducing the sideboard to 7 cards…
8 votes -
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Invalid Deck - Sideboard size bug
My deck is being flagged as invalid for having more than 15 cards in the sideboard, when it has 12
16 votes -
Brawl deck invalid even though all cards are valid
Rats deck is considered invalid for having multiple copies of the Rat Colony card, which allows multiple copies of itself in decks.
15 votes -
Invalid deck error
After the newest update, my Standard deck is invalid due to a side board error. It says I can't have more than 15 side board cards but you can see in the image that it is 60/15.
23 votes -
Invalid Deck: Decks cannot have more than 15 cards in the sideboard. It says this when I have more than 7.
Invalid Deck: Decks cannot have more than 15 cards in the sideboard. It says this when I have more than 7.
25 votes -
Invalid deck
Outlaws of Thunder Junction cards are showing as invalid in alchemy decks
1 vote -
Invalid deck bug
After the update today a deck I have been using for months is being flagged as invalid. No cards in the deck appear as red/invalid and when I click save it says: “this deck contains too many copies of a card.” I have 9 nazgul in the deck as it states on the card you may have 9 copies in a deck, and Ive played hundreds of games with this deck. Can you please give me some support? I enjoy using this deck and dont want to stop playing the app because of a bug. Im seeing this…
17 votes -
Match Against Bot with Invalid Deck (cards not in collection)
Hi.
I have a suggestion about match against bot.
In physical game, I can get a card from my friend or in a shop to test a deck before buy the cards.
In MTG Arena, I can build a deck with cards not in my collection.
But a deck with cards not in my collection, I can't play matches against bot to test this deck.
Is it possible to allow a match against bot using a deck with cards not in my collection to test?12 votes -
Brawl Deck Invalid for having multiple of the same card with “A deck can have any number of cards named” Cid Timeless Artificer
I have 13 Cid’s Time Artificers in a deck and since the new update Arena is saying I have 12 invalid cards and won’t let me use the deck.
6 votes -
Deck Validation failed (Invalid Deck)
Getting error Invalid Deck/Deck validation failed in Historic format
26 votes -
Duplicate cards
After the update that occurred yesterday (07/08/2025), the decks I was using with Persistent Petitioners, Relentless Rats, and Slimes are now not letting me use multiple copies of the same card in Brawl. It has deemed my deck invalid because I have duplicate cards however the card specifically allows for duplicates.
I'm on PC.
Thanks
12 votes -
"A deck can have any number of cards named..."
After this update all the cards that you can have any amount of cards in your deck as in ***** Against Humanity and Hare Apparent are coming up as invalid decks now.
6 votes
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