I'm pretty sure the part of the Magic the Gathering game engine that implements the card rules uses something like it: https://magic.wizards.com/en/news/mtg-are

I'm pretty sure the part of the Magic the Gathering game engine that implements the card rules uses something like it: https://magic.wizards.com/en/news/mtg-arena/on-whiteboards-naps-and-living-breakthrough https://magic.wizards.com/en/news/mtg-arena/on-whiteboards-n...