I don't understand something, when I remove cards from my deck, they sometimes disappear from my collection. I have observed this many times and at first thought that I had pressed some hotkey to accidentally disenchant them, but now I'm sure of it, there are cards that are currently in my decks, which I can play normally, but which do not appear in my collection. There are many of these cards and a common theme is that they are all animated.
TLDR: I have some premium cards in my decks that are not in my collection and I am very confused
The only thing I can imagine is that when I started playing, the starting decks were different from today, so when the "core" set of cards that you get for free as a newb changed, I also lost the ability to use those cards, but they still remained in decks I already had?