Hi. I found your site through someone on Reddit and got all my buddies to join up. Love it. Absolutely amazing site. That being said the feature requests I would like is the ability to have my card list exported via XML or a universal spreadsheet format that Excel/OpenOffice/LibreOffice can all open that is customizable. Meaning you pick what columns you want included (price, name, type, set) and have it export with more robust formatting.
The other feature I would like is the ability to check if I have all the cards needed to make a deck I've found on TappedOut or anything like that. Possibly a whole box where you can format it something like this:
24x Swamp
4x Infiltration Lens
1x Arrest
And have the site check to see if I have everything needed to make the deck. If I don't it would be super cool if it would list off what cards I need and how many of them.
These are just my suggestions to make the site better. IMO one of the best parts of having an online digital database of my whole collection is the ability to export it all as a list and easily check what cards I have in what quantities. These features I suggested would add a LOT of options and would make the site much better.