One of the first decks I constructed on Arena is missing almost all of the cards. I'm being told to craft all of them, since none of them are in my collection anymore.

My Esper Adventure deck cant be played with because it says I'll have to craft a rare card... But I have alle the cards crafted. I wanted to play in the Arena Open today because I got to Mythic last month and therefore I believe I have a chance, but I cant play with my Esper deck even though I have all the cards...

I had similar problem. My old decks were suddenly mostly empty. As it turned out, they just had the wrong game format set in the deck details (click on the small deck box in the upper right). With the recent launch of Alchemy all of them were for some reason set to Alchemy format. I changed them back to Historic and they were again full and playable. This can also happen after rotation, you need to change your old Standard decks to Historic.

Same issue here. I am missing in MTGA 36 uncommons from Kaldheim set I created months ago using wildcards to complete the collection. Funny thing, using trackers like MTGA tracker and Untapped.gg that use the log file to get data, they display my collection normally.
Tried to report this as a bug but also the assistance section seems bugged as it doesnìt make upload log and screenshot files...

Most of my cards and decks missing.and many starter decks appeared double.Now i cant play historic,and i had give some money

Hey I have this same issue and I've reported it but my ticket keeps getting closed without any follow up. Can you help?

Hello,

For this issue, please submit at: https://mtgarena-support.wizards.com/hc/en-us/requests/new and select 'General Questions'.

Thanks!

While playing again mtga this year on mobile. I found out that lots of my cards in my collection were missing. Including decks that I built last 2018(my red deck with lots of rares and mythics) my esper deck, and my boros feather deck card inside have missing cards inside. You can also see my scrnshots that my other preconstructed decks also have missing cards inside.

Hope to get a feedback from you guys