Logged on today to find about half my decks are incomplete and missing basic cards like backstab and frostbolt. For some reason the only basic card I have is Mark of the Wild. Restarting the game doesn’t help.
There’s also an extremely long loading time before I was able to open my collection.
May be related to a similar bug I encountered throughout last week. When my internet disconnected and reconnected, I got 2 more copies of every basic card, eventually got 8+ before restarting Hearthstone.
Edit: Okay now I logged in and my cards are back for now… I’ll edit again if they disappear again.