For weeks now, I’ve had a lot of cards not showing up, especially Death Knight’s. This error is still not fixed.Bravo.
I am not sure if this is a bug… did you check the core rotation list? Many DK cards left the meta and some added to the core. Year of the Pegasus Core Set Update
Many of daeth knight’s cards still do not exist, they have been deleted. Patchwerk, lord marrowgar, gravyard shift…many many cards missing.
You never owned these cards… they were part of the core set. Removed with the rotation, so you need to craft them if you want to use them again…
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Thanks for the explanation 
The excellent game design of the excellent team has made the game so unbearable that I wish patience to the people who play intensely.
PS: The game has been boring for years. It got even worse with core.
You’re Welcome, I just tried to help. 
Yeah, the game is still insanely unbalanced but until I can reach my success (D5) with my own decks… (not even hoping for Legend again…) I play.