One of the great Magic design debates has been renewed on Mark Rosewater's Tumblr blog in recent days: Namely, whether and what to keyword "target player puts the top N cards of his or her library into his or her graveyard," commonly called milling.
It all started when the-mind-architect-of-thought asked, "Will "mill" ever be officially keyworded?" and Rosewater answered:
Maybe one day but it won’t be the word “mill”.
This, of course, caused an uproar, from fans of mill who want it to be an official part of the game language. The argument for is that it's already an established idea, and against is that it has little to do with the flavor of the keyword and simply is meaningless to someone hearing of the term for the first time. There's also the argument that it shouldn't be keyworded at all, because there are too many variants of this basic mechanic for it to be an evergreen keyword action (such as exiling and Mind Grind-style mill).
Got a favorite from this list? Prefer to see it in print as "mill" or not as a keyword at all? Let me know in the comments.