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The source for them using CLIPS is a conversation I had with Arena team lead Ian Adams in a Magic-community Discord.

The source for the bug is a video WotC did that I can't find right now that featured the Arena team talking about developing Kaldheim - the bug came from the card Alrund, God of the Cosmos.

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Here's an article: https://magic.wizards.com/en/news/mtg-arena/on-whiteboards-n...

> So first, a quick summary of how the rules engine works. When a game of Magic is in progress on MTG Arena, the program that is tracking the state of the game and enforcing all the rules-correct card interactions is called the Game Rules Engine (GRE). It's one of the two main programs that we work on. It's written in a combination of C++ and a language called CLIPS, which is a variant of LISP.

Thanks for sharing!

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