When Planar Chaos was released in Winter 2007, magicthegathering.com did a theme week of "What If?" articles, and Kelly Digges wrote one that is still being talked about today - a flavor reimagining of Magic that posits a possible "Space: the Convergence" game that would have been a sci-fi-themed TCG with all of Magic's mechanics. Naturally, custom card designers jumped at the idea of converting all of Magic's flavor and terminology to Space's, and recently, Mark Rosewater got a question on his Tumblr blog about whether the popular notion could become part of printed Magic.
When xteban asked, "could "Space: The Convergence" be made in silver border?" he answered:
How about this? If we did it, it would have to be silver-bordered.
This would seemingly be the "mechanics work fine with normal Magic but flavor is irreconcilable" version of silver borders that Mark mentioned when discussing the possibility of a third Un-set. The audience reactions posited a lot of different takes on the idea.
User miloapplebloom wrote, "How about this : Space the Convergence with the Un cards as the extra cards like the Time Spiral purple symbol cards," while kitchentablecast said "I would love to see this—my only concern would be that it’d keep Space from ever seeing print as its own game. Since you all refuse to print it anyway (At least that’s my understanding), I thing this would be a fantastic use of silver border." While many of the replies requested that Wizards not release a reskinned Magic in favor of a possible fully new space-themed TCG someday, snackplaylove had perhaps the most intriguing idea for a combination of an Un-set and a sci-fi game: "A third UN set that is basically S:TC with mockeries of bald headed space marines, space donkeys, super hero tropes and lots of goblins with lasers would be greatly received. UNmagical?"