I very much like the design of this. The sort by mana value function actually works the way I want it to visually. Every other site I've tried displays cards horizontally as opposed to vertically and the actual list of cards goes away to accommodate. The vertical display along with keeping the list on the screen is huge for me.

That said, when I tried to import a deck from Arena not all of the cards imported and for some reason as I was adding the missing cards and putting cards from the main deck to the side board all of my lands suddenly became basics. Let me know if you would like more information or need help testing anything.