Neurok Transmuter’s second ability interacts strangely with March of the Machines from the Mirrodin set. If an artifact is an artifact creature only because March of the Machines is on the battlefield and you then activate Neurok Transmuter’s second ability on that artifact creature, the result is a permanent with no types whatsoever. Neurok Transmuter’s ability removes the type “artifact.” March of the Machines depends on knowing what is and isn’t an artifact. The permanent won’t be an artifact when March of the Machine’s effect is applied and therefore it won’t be turned into a creature.