This is strictly a thought experiment. I was looking at Todd Anderson’s and Brian Braun-Duin’s video on SCG yesterday. Anderson was playing a version of Esper Dragons (and winning), while BBD was playing a monogreen deck. That latter deck had plenty of “spell lands”, such as Foundry of the Consuls, Sanctum of Ugin and Spawning Bed. It had total of ten such lands.
I thought to myself, “well, the mana is very good in the format, but the format also has plenty of good colorless lands, maybe we could do a colorless deck?”. Can we? Probably not, because colorless creatures are always much higher on the curve than similar creatures with colors (with the expection of Wurmcoil Engine). It will be a slow deck, but I wouldn’t completely discount it. Just mostly.