After my first listen to Operation: Doomsday in years last November, I realized I’d done a disservice to my brain by denying it frequent revisiting to a rap album of astonishing mellifluence. Word drink without succumbing to logorrhea, MF DOOM kept his promise to treat rhymes like dimes: exact change when required. Doomsday, the label-quashed KMD album Deluxe Edition, the Danger Doom collab The Mouse and the Mask, and, of course, Madvillainy — the imaginative reach of the samples (SOS Band! “Bungalow Bill”!) complements the words. He hadn’t released an official studio album since 2009’s excellent Born Like This. We needed a decade-plus to catch up with his fecundity, which, with his appetites and penchant for alter egos, made him hip-hop’s Prince.