Mouseke666/ScryForge ? reverse-engineered prompt

Build me a C# app that takes a deck list from a cards.txt file and turns it into printable PDF files for Magic cards.

I want it to read the list, download the card art, optionally run an image upscaler on the downloaded cards, and then generate two PDFs, one for normal cards and one for flip or double faced cards. It should also support custom card images from a Custom folder, including matching front and back images when the back file name uses the __back_ prefix. If a card is a flip card, put it in a separate output folder and handle it correctly.

Please include clear console logs with timestamps, clean up temporary files when it is done, and open the output folder at the end if possible. If you need to, look up current docs for any external tools or PDF handling details. I also want the whole flow to be easy to run from one place, with the steps happening in the right order automatically.