Want to cop the rarest self-lacing shoes of the year 2015? Profiles In History has the original Marty McFly Nike Mag up for auction. Custom made (by Doc Brown, of course) and actually worn by Michael J. Fox on set, these are some of the rarest kicks around. Profiles is estimating their value at $12,000 to $15,000, so make a quick stop at the bank and then head over to the official auction.