Proxy Templates
Here are some useful ways to print your own proxy cards or decks at home or at your friendly local copy store (I've found using the Color Laserjet at the copy store is the most cost effective and gives the best quality for larger print jobs).
The Cards?
If you open the repo behind this website directly (WARSTCGPC GitHub Repo) - you can click on the green "<> Code" button in the upper right and select "Download ZIP". This will download ALL the files that make up this website. When you extract that zip, you will see a folder called "img" - inside of that folder are all of the individual cards from all the sets. These are all updated with the Errata from the Comprehensive Rules v1.5
Scribus Template:
This method is what I've moved to as it makes it easy to create multiple page pdf's. You will need to install Scribus (an open source software).
Once installed, you can download and open the Scribus Template. This is a US Letter formatted multipage PDF. You can drag and drop card images into the image boxes. Once you have done this, use CTRL+A to Select All and choose "Adjust Image to Frame". This will resize all the images. They will probably look fuzzy in the preview - you can Select All again and choose "Preview" to set the image resolution for the display. This does not impact the quality of the exported PDF.
Bonus Tip: You can click on "Windows -> Scrapbook" and it will pop up a small window. This Scrapbook allows you to save items and layouts. On the Blank page - Select All and right-click to "Send to -> Scrapbook -> Main". Give it a friendly short name. Now when you have a blank page in Scribus, you can click once on the page - and then double-click on your entry in the Scrapbook and it will add the 9 Card Image Fields for you!
When done - delete any blank pages and choose "File - Export - Save as PDF".
Adobe Reader (Try the other first)
This single page US Letter template is designed to allow easy printing. You can open it, and click on the image frames to upload an image and it should work. This is an older method I used.