OP: Soulciologist Malicia
On several occasions I have added a Golden copy of a card to only have Duels change it to a non-Golden version. This happens consistently with Soulciologist Malicia.
Additionally, Summoning Ritual appears to keep adding itself to my Demon Hunter decks. I’m almost positive of this. I did not add it to my current run but it is still in my deck. I also did not pick it up along the way.