If Machine God’s Effigy copies a land with a basic land type that has become a creature due to an effect, it will not have any mana abilities that land had due to its land types (it will have the one it gives itself, though). For example, if a basic Forest became a creature due to some effect, and Machine God’s Effigy entered the battlefield as a copy of it, it would be a basic artifact named Forest and have “{T}: Add {U},” but not the intrinsic ability “{T}: Add {G}.”