South Korea's mandatory military service is a tough one. The length of service is around 21 months, applies to males between 18 and 35, and it's not a place where games like Hearthstone are allowed. Except if you're a dedicated fan like these soldiers who, unable to play the real game, made their own version.
They actually drew all the cards, a huge amount of them (I don't want to think about all those Grim Patrons), on notebook paper and cut them into proper rectangles. By rolling dice they can deal with the RNG and that's it. Everything's set.
Getting a few packs of Magic cards might have been easier to play something similar, but who cares!
Gotta love their version of Murlocs.