I have noticed several times that I get the not-upgraded version of cards that I saw being played in upgraded version during the game. Of course, it is possible that the deck also had not-upgraded versions of the same card, but I wonder if it might be a deliberate feature of the arena, that it does not give you the upgraded version of the card.
I am definitely positive, that I never won an upgraded card from the arena and I won many spins, some even against decks with maximum upgraded limit skill (which still does not mean all cards are upgraded in the deck of course, but it is likely).
So, anyone knows for sure if this is a feature, or I just did not get lucky to get one ?