There will be a reward for every completed subset. There are 6 rarities meaning you can collect a total of 6 premium NFTs made by Rory McQueen. Additionally, you have a chance to win a mint #1/1 NFT every week after each quest.
The only thing you will have to do is make sure you have the complete set in your inventory on the deadline, and make sure to keep it in your inventory until you have received the premium card (the day after the deadline!).
The raffle for the #1/1 NFT will take place at the end of each quest as well!