If you were worried about safely tapping Kilo, stations, convoke, and untapping cards like Manifold Key and Unwinding Clock, can solve that problem
It's literally in tutorials used to introduce new players to Arena for the first time, and there's no reason it can't exist in paper
One user suggested that someone should examine the cards printer metadata, or machine identification code (MIC), a kind of digital fingerprint that appears as a series of yellow dots that reveal the date, time, and printer serial number in a grid pattern
Brawl Not Legal Vintage Legal Timeless Not Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Not Legal Toolbox Notes and Rules Information for Ethereal Valkyrie: Because the card in exile becomes foretold, you can look at it in exile
I remember this being one of the few singles I bought as a teenager, back when traveling to the nearest game store involved printing out the address with a map because we didnt have smartphones in our pockets
He was a shop owner and said he couldnt tell the difference (Im going to give him the benefit of the doubt) but point being, fake cards are ubiquitous and somewhat undetectable to the novice collector
