Without thinking, post the first Simpson joke that pops into you head

White - Theriozoic, Age of Beast - The Cenozoic Era

Red - Pyrozoic, Age of Fire - the Cretaceous Period

Green - Titanozoic, Age of Giants - Triassic to the Jurassic period

Black - Necrozoic, Age of Death - Carboniferous to the Permian period

Each period of geologic time on this plane corresponds to a specific color of mana:
Blue - Enigmazoic, Age of Mystery - Cambrian to the Devonian period

An idea for Magic: The Gathering plane where people have learned how extract mana from the fossils of ancient magical creature. This eventually awakens the vengeful spirits of these long dead monsters. #MTG #MTGfanart