Having a playground will be very useful. I get that it's a beta version, but it would be great if the original card would be on top of the list, in order to get back to the original set up for that card slot.

The card based filters will be to sort through my cards available, in total? Right now, I can only see my CA cards available - and I use those to keep kicking in modern, so they're definitely no land cards :-D