Y'all need to look at the collection screen. From the deck page you can click 'collection' in the lower left corner and it will show you your full collection regardless of legalities. Some cards do disappear. I have had cards glitch out on me, too, but sometimes they're just not legal to play in any arena format and you have to find them in your collection, not the deck builder. Good luck!!

Hello,

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

Thanks!

I own Dragon's rage Channeler, I'm looking at the card in one deck, but it wont show up no matter what I put the settings at. Its really distressing seeing how I've spent money to open packs to buy these specific cards.

This has happened with a few cards for me now but seems to happen more frequently with the new art style cards.

I was hoping they'd notice and fix the bug by now. Same thing just happened with Compulsive Research.

i have a card i have gotten multiple copies of that shows up in the pack screen but doesn't exist in the collection its name is Day Of Judgement oi dod not have any screen shots but i got it out of the newest set packs