I think it would be nice to be able to search for decks I can build with the cards I already have. I collected back in the day, am getting back into things, and have found pretty much all of the decks on this site are built from mostly new cards.

Is it possible to compare my inventory to a bunch of decklists and return an ordered list prioritized by which decks contain the highest number of owned cards?

That would be awesome in theory, but hard to implement I would think.