New cards missing
I’ve been missing several cards (notably rare and mythic rare) cards from new packs I just opened.
On at least 4 occasions, I opened a pack to find a card that I really want to add to my existing deck, then go into deck builder immediately, and the new card is simply missing. I search by name, rarity, colour and nothing...
This seems to happen quite often.

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Hraknar#23734 commented
I've noticed this twice in the last week, with Araya, First of Locthwain and Sheoldred, Whispering One. I cracked each in separate March of the Machines packs and was super excited to be able to work them into my mono-black deck, yet when I attempted to find them, I was unable to do so. I have tried finding the card by checking "Not Collected" in the settings as well, and still can't seem to locate these cards.
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Alexandriaforlife#61504 commented
I bought a pack of mythic baldurs gate cards and recieved a few new cards. The one of note that i had gone to out in a deck was The Book Of Exalted Deeds. When i went to look for it, it isnt showing up. Now im wondering if im missing more cards like this. How many cards could i be missing because i just figured they should be in my collection after opening packs.