Blank cards can be found here: https://www.reddit.com/r/inscryption/comments/qu0sgd/some_blank_cards_of_every_kind_for_custom_card/?utm_source=share&utm_medium=ios_app&utm_name=iossmf
Font for the text and numbers can be found here: https://www.fontsquirrel.com/fonts/heavyweight
Most drawing portraits are just pixel art in black and a transparent black.
And sigils can probably be found somewhere on this subreddit.
This can all be put together in any free drawing (photoshop-esque) program. Recommend gimp for drawing.
That’s about everything you need.
I found this 200 piece pack of tiny adhesive magnets for only about $10: https://www.amazon.com/Fun-Express-Small-Adhesive-Magnetic/dp/B007F0R6OQ There's a bunch of similar products in different sizes and such, all pretty cheap.
You might make it work, but I'm struggling to think of how to make a magnet a permanent piece of the card without it being heavy or sticking to other cards.
Then I thought of this as a non-permanent alternative: Have the magnet permanently a part of the sigil, but not part of your cards. When you want to attach a sigil to a card, put a second magnet behind the card, then hold the sigil up on the front of the card so the 2 magnets line up. If the cardstock isn't too thick, they should pinch the card and effectively 'attach' the sigil to the card.
If that isn't good, paperclips are ugly but perfectly functional. You could also test your sticky tack on the cardstock you have - just make a test card and see how much damage your tack can do to it. Maybe there's different tack out there with varying levels of stickiness?
Very cool, only suggestion I would make is using this bottle instead
I found this on my country e-commerce app, but it’s also on Amazon: https://www.amazon.com/Inscryption-Lonely-Stuffed-Animals-Birthday/dp/B09TJ5H42M/ref=sr_1_19?crid=1DAQ3NTS53K13&keywords=inscryption&qid=1648019143&sprefix=Inscr%2Caps%2C309&sr=8-19&th=1
I found this on my country e-commerce app, but it’s also on Amazon: https://www.amazon.com/Inscryption-Lonely-Stuffed-Animals-Birthday/dp/B09TJ5H42M/ref=sr_1_19?crid=1DAQ3NTS53K13&keywords=inscryption&qid=1648019143&sprefix=Inscr%2Caps%2C309&sr=8-19&th=1
I found this on my country e-commerce app, but it’s also on Amazon: https://www.amazon.com/Inscryption-Lonely-Stuffed-Animals-Birthday/dp/B09TJ5H42M/ref=sr_1_19?crid=1DAQ3NTS53K13&keywords=inscryption&qid=1648019143&sprefix=Inscr%2Caps%2C309&sr=8-19&th=1
I found this on my country e-commerce app, but it’s also on Amazon: https://www.amazon.com/Inscryption-Lonely-Stuffed-Animals-Birthday/dp/B09TJ5H42M/ref=sr_1_19?crid=1DAQ3NTS53K13&keywords=inscryption&qid=1648019143&sprefix=Inscr%2Caps%2C309&sr=8-19&th=1
Yes, this one's on a Pi Zero W. The screen was ~$20 and supports Python/C. This is the specific screen, it also supports red but I wasn't able to get it to work with just a bmp image.