More than a decade and a half ago, I have a recollection of a friend coming to school one day with a small book which was an early Magic the Gathering RPG. I recall that it was about being a planeswalker and some other minor details. I can't for the life of me remember anything more about it, or find it on ebay. Does anyone know anything about this game? My interest is simply for nostalgic reasons.
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If your timing is right, and your terminology close, then what you might have seen is an Everway sourcebook. Everway was a card-based roleplaying game released by Wizards of the Coast concerning people known as spherewalkers who can journey from world to world. It could easily be mistaken for a Magic: the Gathering RPG.
To be clear, however: no official Magic RPG exists, or has existed. Wizards of the Coast's marketing department has enforced a strict silo between the TCG and RPG development divisions.
EDITED TO ADD: Ryan S. Dancey has, on Reddit, posted what can be seen as a comprehensive supplement to this answer.
Other Wizards of the Coast employees chime in on his Facebook page.
Times certainly have changed. Here's an official writeup of Zendikar as a D&D setting, straight from Wizards of the Coast.
There was a WotC published rulebook for MtG, which was rather scarce. I think I still have one or two copies lying around. It could be mistaken for a roleplaying manual.
There also were some early books published (The Arena) which had a mail-off coupon for free card(s). Which were written as novel(s), but could be viewed as a roleplaying sourcebook.