Random Mystery champion permanent missing in shop

When the rune changes came into effect, i received quite some blue essence. With that blue essence, I bought many random champion permants in the shop for 3950 blue essence, as i only needed 4800 BE and above champs. Recently, my friend asked how i bought the mystery champions, because he couldn't find it in the story. Surprised as I was, i couldn't find it either, and nobody of my other friends can. My question now is: Has this option been removed from the store? If yes, will it return.
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