Add a deck and your collection, and get a print-ready PDF of only the cards you're missing.
If a link stops working, use Paste deck instead.
Copy the deck as text from Dreamborn, Inkable or Lorcanito (Export / Copy as text), or paste a Pixelborn code.
On Dreamborn, open Collection and export it as CSV.
Leave both empty to print the whole deck. Any printing of a card (foil, enchanted, reprint) counts as owned.
Print at 100% / Actual size, not "Fit to page", so cards come out at real size.