You wrote: “It takes a random card from the cards you have used and gives it back. Excluding spells in the arena.”
This is not true. I have gotten a spell card as the extra card as recently as yesterday. This is still a bug that needs addressing, though I am pretty sure you already mentioned this being on the list of things to fix for the next update (which should be soon, no? How many weeks has it been?)
Thanks,
sutekh137