While many Magic: The Gathering set names have gone through name changes, only Urza's Saga had one nixed then (technically) used later for an odd reason.
Despite coming out 30 years ago, Ice Age still influences new Magic: The Gathering mechanics and such to this day.
There are only four planes in all of the game of Magic: The Gathering that will never be revisited.
Every once in a while, a joke set or deck becomes a reality - this was true to the relationship between Liliana and Gideon
Magic: The Gathering's New Phyrexian Invasion was infamous for covering multiple planes while others went untouched.