uncommon. According to the Mirrodin
Style Guide, "The interior of Mirrodin is a vast, featureless expanse of silvery, dull metal. The only features of the landscape are the mycosynth, the occasional artifact creature, and Panopticon. The interior is lit by the mana-core sun, which washes everything in intense, pure-white light. The mana core appears as a giant sphere of pure white plasma suspended at the nucleus of the planar sphere."