It would be great if there were some way to filter based on the date you received new cards (or filter to show cards received over the past X number of days), so you could easily find all the new cards you received over the past X number of days. I know that the system automatically flags all new cards when you edit an existing deck, but that flag goes away as soon as you see the cards in one edited deck. If you then go to edit another deck to see if any of the new cards would be good to enhance it, they are no longer flagged and then have to just remember what all the newly received cards were or search in some other manner through all the cards you have. I am not aware of any way to use advanced search terms to find all newly received cards either.