Thank you, I’m very happy to hear that! :)
That is weird, it prints at standard playing card size at 100% size for me. Did you use the correct version for your paper? (A4 or letter)
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Yes, though perhaps there are other settings like "shrink to fit" or "fill page" or "borderless print" that interfere with the process. However there is also another factor, which is that the cards are not aligned, so they pretty much need to be cut one by one as opposed to cutting them all at once precisely with an exactonknife & ruler.
My suggestion (what I did) is: go to https://mtgprint.net/ and create a pdf with 9 random cards, with some 0.2mm margin between the cards and without "cut guides". Then you can open the PDF in inkscape, where you can align your card images to the background MTG cards for perfect size and alignment. Then you can remove the eccess MTG cards and the card-trader logo, add your logo if you so desire and export as PDF. If you keep an SVG project with the background cards still in place it will give you the blueprint for future "extended" card sets which will remain perfectly aligned and will print to exact size.
I hope this helps :)