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Darn- thought that'd be it since that game has been in Beta forever! haha
One more game that I specifically flashed on was Space Station 13, tho I'm not sure if there's magic in that one... http://spacestation13.com/media/
If it's not that then it might help to look through this list of MM Os w/Sci-Fi themes & see if you recognize anything there...
http://www.mmogames.com/sci-figames/
GL!

The game kinda looked like straima and magic existed. The game consisted of exploring holographic looking space levels. there were multiple characters and i think the guy i watched play it choose a hacker/mage character. it was also in beta by the time i saw it.