So I am that guy who has bought everything. Have my collection double sleeved and divided into two large (now 3) card containers to allow easy deck building or access to my villains!

Recently when organizing and preparing to sleeve some new-to-me content, I realized I am missing some key cards. I know that I am missing the Rhino deck from the core box and that got me thinking...what else am I missing?

So I wanted to catalog my collection and cross reference it with an existing list of cards or content from the game. Does anyone know of a Google Document or spreadsheet that has this information? Do I have to look up every card in every set and make my own?

Also, is there a second hand market where I can buy cards I am missing or extras of cards that are used alot like Maria Hill, who you only get one of in the core box?