Emperor's collection, which ended up with SF for various reasons, is also catalogued, [here].
Are Emperor's old cards available for trade? There's a number of those that'd be good in the Cube... --qqzm
(FileFactory? links; if MS or whoever wants to rehost them somewhere you don't have to click through an annoying ad, feel free).
The format is just what MTGStudio does, ignoring large parts of it are recommended. Notably
I didn't sort out basic lands by expansion or art
Multiple copies of the same card were listed under the same entry even if they come from different expansions
I didn't even find the "Foil?" field until I was 4,500 cards in, so foils are not checked.
The "Price" field is in dollars and supposedly an average of a few single-card sites; I dunno how much credence to give it. It has not much to do with me.