With persistent creatures, man-lands, planeswalkers, equipment and all manner of other diverse and awkward threats control decks are stretched far too thing to have much freedom for luxuries like FoF in 40 card singleton cube decks
The Commander Effect There was an error retrieving a chart for Nicol Bolas Commander has made the market for misprints crazy
For more price spike stories, check out this old enchantment that works brilliantly in Eldrazi decks, and this legendary land that's been boosted by Legacy
Being instant also allows for further safety, potential value and of course some trickery
My next deck a Tribal Rakdos build around Raphael, Fiendish Savior, and his love of Tribal and loving creature that went to the graveyard from anywhere
However, this may vary based on cards that can fulfill a similar role as a color fixer, like Utopia Sprawl or Treasure token generators