@guvato Based on my experience, you can't win any card that is newer than 45 days (except for the new special event card of Melena)...
Updating my own earlier post: unlike some of the earlier promos, this time the 45 day limit seems to be refreshed while the promotion is ongoing. In one of the earlier promos it seemed to be so that the limit was set once the promo started: you could only win cards that were 45+ days old on the first day of that promo. None of the cards that became 45+ days old while the promotion lasted, were available to win at any point.
This time, it seems that the day limit is updated during the promo. When I played on Friday, "regular" card wins stopped altogether once I had won the last of the missing cards 45+ days old.
Now that I spinned a few more times (= making my Joker stakes get from 192 to even 200 for heck of it :) ), I won Madison's "Sunny Day" (45 days at the time of playing today), Florane Russell's "Unleashed" (45 days at the time of playing today) and Valeria Borghese's "Up For Review" (47 days at the time of playing today).
Above is just to let you know that you can win more cards now up until thursday than you could win on weekend.