I had the same issue. Deck is created with no missing cards. When I tried to save it it said I did not have all the cards. I hit Craft all and it took Rare wild cards it should not have to create cards I already have. Please investigate and refund the wildcards...

Recently created a deck and played with it. Went back to editing it, went to save and it said I didn't have all the cards?! I clearly have all of them, even deleted it and built it again and still can't save it?! Wtf?!?!

I went to Edit mt Dragons Deck and created my cards then the new update happened and when i came back in i cant play with it and editing it no matter what i do its says i dont own cards. I have no idea which cards are the problem to try to fix as i own them all.

Just got this error when updating new art on my brawl deck. The fact that I purchased new styles has made my deck unplayable.

After the maintenance on 07/28/2022 my deck builder is no longer showing extraneous copies of cards. I was able to identify in my case that the builder showed 2 "Wizard" class enchantments, and 4 "Druid" but I only have 1 and 2 respectively. A few other cards were identified as showing more than I actually owned between my previous post and the maintenance and those are also now reflecting the correct amount.

Resolved: For everyone struggling with this issue, I have figured out why. I do not think this is a bug. The extra cards that are showing in your collection but are not allowed to be used, are from the Alchemy set/Baldur's gate. These cards are not allowed to be used in standard mode (I assume it was a wotc decision) so if you find you have 4x of the same card but 2 are from the sets mentioned above, you must craft them from the older sets which are allowed in standard mode. I hope this helps. Good luck :)

I also get cards that are marked as selected for a deck, but are not in my deck. See screenshot with Gala Greeters.

Same problem here. I can't build a deck anymore. I get this error so often! Please fix.

Same problem, sometimes you can find the card by process of elimination but not always. Can’t verify it but I believe I first had the problem with cards acquired through “jump in”

Same problem here. All cards are crafted -> "Deck contains cards not in your collection.
Sideboard is empty.

Same here happening with Goldspan Dragon and a Kurgan intimidator

I also have this problem. I got a double drop on a pack of "Earthquake Dragon", when I went to add it to my deck it says y"Deck Contains Cards Not in Your Collection". I try to add only one instead of 2 and it turns out to be a legal deck.
I assume the problem is that they came for a double drop in a pack.

Cabbage#63956, KRAUTH#80832, Mintman#63051, DragonKnight#29252 do you remmenber if your copies came from a double drop on a pack?

Adding log, not sure if it'll help

Also having this same problem. Seems to be random and I'm unable to identify _which_ card is causing it. However, as seen on the screenshots, _none_ of the cards are "not in my collection"

Same problem. I have all the cards but for some reason the game is only accepting one of my 2 copies of goldspan dragon and I would rather not have to us a mythic wildcard to make another one.

Same Problem with Minsc&Boo from HBG. Collection says 2 copies, but deckbuilder only accepts one.

Same. Happens with wizard class for me.

This has been continually happening to me to, primarily after taking part in the Dragons and Dungeons Historical Singleton event.

My collection is showing that I own 4 copies of Druid Class but for whatever reason I can only use three. I don't remember when I would have obtained a 4th copy of druid class but it was causing the game to tell me my deck was invalid. The game might be telling you that you have a 4th copy of a card that you don't actually have