Harmonize is another STX card not showing when I search for it. I won one, but it is nowhere to be found. I searched owned and not owned cards, no sign of it (Alt Art) or the other (standard) version.

Same here! I just lost "Day of judgement" and I know I have had that before. If you open a pack and you get a card that is banned, you should reserve a wild card worth the same value the card you lost. So you can create a card you want with the equal rarity.

As it turns out, some of the cards you pull aren’t legal in certain modes. I got really excited about pulling Tendrils of Agony from a pack, but I couldn’t use it! Looked it up- it’s not legal in standard play. Quite angry about this because it’s a beautifully designed card.

Same for me. I’m missing a lot of cards from Strixhaven (haven’t looked for others). I’ve been playing sealed and premier drafts non-stop since it dropped. Certain cards I know I’ve had 5-8 pickups and only have 2 in my collection.

I know I have gotten two Teferi's Protection cards from STX packs, and I do not see them in my collection, in either collected or not collected. I fear that I may be missing more.

Same here, a lot of cards just disappeard, i remember i opened a white inst. that blink creatures and another green sorcery that shuffle the graveyard into lybrary...all gone.
STX

STX was released yesterday and I have opened about 6 regular (not draft) packs. With so few cards I can count 42 STX cards that I have in my collection. Since each online regular pack contains 8 cards (1 rare or mythic, 2 uncommon, and 5 common) I think I should have exactly 48. Upon opening the packs, I know I saw a "Day of Judgment" card and a "Tendrils of Agony" card because I got excited about putting them into a deck but when I went to add them to a deck, they were not in my collection. Thank goodness I detected this problem before I invested more time and money to get more cards. I don't think I would've ever noticed the problem if I opened too many packs all at once.
Being a programmer myself, I admire the amazing job these programmers have been able to pull off. Having said that, as of this comment posting, I see that there are 21 votes for this issue so even though it looks like this missing card problem (or set of problems) has existed from at least 06/29/2020 to 04/16/2021, my guess is that it will remain low priority for quite a while. For me it would be great if this problem was fixed sooner rather than later but they probably have more pressing things to work on. In all good conscience I can't invest any more money or time on this game with this problem. I loved this game and it was great while it lasted. Thanks to all who played with me.

Same issue. Lucked out and opened an alt art Day of Judgement from an STX booster and now it’s nowhere to be found. As others have said, I can’t even find it searching for cards I don’t own.

Same problem.. today i've opened the new expansion pack.. and lot of cards that i found inside those pack disappered and i can't find them... How to fix it?

weather the storm is missing from the game i have 2 copies but the problem is i cant find the card in any format to add to or create new decks to use and enjoy please help thank you.

My 1st 2 (and final) Strixhaven boosters vanished. I opened them, saw the cards(they were great) and poof. Can not even search for then in the Unowned collection,=.

I'm having the same issue. if I import a deck, the card will appear, but otherwise it doesn't exist at all. Cannot craft, regardless of what format or filters I select.

Now I just lost Ghalta from my inventory. Wizards what is going on?!

Some of my cards are starting to vanish as well :/

I've been sending mails for a month. A MONTH. One day I decided to craft all the mythics left from Kaldheim and few days after that the cards were missing. All I got was "I see that cards were added to your account". I KNOW THEY WERE ADDED, THANKS A LOT. THE THING IS THAT NOW I DON'T HAVE THEM. All I need for them is to check how many Kayas I crafted and compare with my collection. I am a programer, I know how it works. The they can continue with the rest of the mythics

Same happened to me with Karn, the Great Creator. like he doesn't exist. Also can't even find general questions.

I am sure I had 1 copy of ascendant spirit, graven lore and search for glory but mtg arena deleted them for no apparent reason. Recently I cracked open some boosters and the cards I have mentioned above were given me as "first" and I am super annoyed and frustrated by that. So, what is the point of paying for this game if my cards (which I tried very hard to get them) disappear for good? If you cannot manage to run a game which hundreds of thousands of people pay for in this pandemic in order to get a slight relief from the mundanes of life, what is the point of building a collection? I don't want to quit the game for good because of this silly issues. We demand an answer, wizards?

I just bought a nissa from the store and it never even made it to my collection but my coins are gone

Ya, same here. Bug hasn’t gotten fixed and they don’t care. They literally told me that we can’t lose cards, yet here we are, without a bunch of cards we paid for.

I mean, what’s the point of paying for this game when we don’t get what we paid for? I’m so disappointed in this company.