From a given card's page, you can click to see all decks that contain that card. What would be very useful is a way to quickly tell which of my decks that card is in.

Yes, i concur with this. This would enable me to see how many of a certain card are currently "unused" (not in any deck).

Thanks for a great site!

I also agree, would like to know what cards are unused so I don't have to search my decks, and also a way to find where any specific card is (in which deck).

Awesome site!

I have found myself looking for this option as well. Love the site!

Yes! I was just trying to find the feature that OP was talking about!

Also Zopwith's suggestion was something I was thinking about as well!

bump. This is the only obvious feature missing from the site. Fantastic tool other than that. Thanks for building it.

i have done this by clicking on the card and scrolling through all the decks it shows up in, but that is tedious. This would be a good feature for finding "lost" cards in decks I forgot I had.

Thanks for all the good work Sebastian!