Rising Star Game has added a new mission with a requirement for you to own something from the Stardust shop, "Its a stick up" gives you the chance to earn more 
So far I have only managed to find the top but hopefully the bottoms can be found before the mission ends, although no end date has been given yet so it may not be a limited time mission.
My recent return to playing Rising Star has meant investing a bit of time in the game and has coincided with the arrival of the avatars and daily tasks. I think both have added a lot to the game and will hopefully bring in more players over time. In the meantime I am taking the opportunity to try and move up the rankings and although I'm still hanging around the 240's at the moment a concerted effort to reinvest all the starbits earned from rave drops, best dancer and missions into unique cards will hopefully see me move up.
Ranking works on the below
Total Unique Cards: 50%
Total Cards: 20%
Total IM: 20%
Weekly Minutes Played: 10%
but has a quirk that a multiplier based on average of a selection of random players from the top 100 for each element, so its a bit difficult (impossible!) to work out what you actually need to rank in a specific position but the more unique cards the better chance...
I've been picking up a few cards via Rising Star Utils, Nftm.art and the Rising Star Market but things are starting to get expensive!, time to start saving up again for the next new card day and try and pick up the unique's there.
getting close with the commons though, although getting multiples for the blends will be tough, probably need to read the PRO tutorial too
In the meantime see you in the Red Rave!