I was gold card locked and 2 five star card. I only got one new card when I opened the 750 star safe and the cards from daily activities are usually duplicates once your a few days into the game.
I have yet to complete all sets. I feel unless you have lots of money in the game you cannot win. I cannot spend money at this time, so once again I will not complete all the sets. I have no clue how to people complete and start a second round. I am barely even trying as it gets discouraging.