In one of my previous "Bringing Homebrew Cards To Life" posts, I describe how printing the Seven Seas PDFs result in cards smaller than standard cards. The size of a standard Guardians card is roughly 2.5 inches by 3.5 inches. A Seven Seas PDF card measures 2.25 inches by 3.125 inches. It's a noticeable difference.
To make a 3 x 3 printing of standard cards, you get a total measurement of 7.5 inches by 10.5 inches, which should fit on a standard sheet (8.5 inches by 11 inches) of paper. But not so fast! Many printers can't print to the edge of the page...you should allow for at least a .25 inch margin on each side of the sheet. That brings the total measurement to 8 inches by 11 inches, which barely fits. That also means the cards must be up against each other with no gap between them. Therefore the PDFs will have 9 cards, arranged in a 3 by 3 grid, with no space between them. If people are against this, please let me know before I get too far, and I'll lay out a different grid (maybe 2 by 4).
I'll post some images of this concept soon.