The Invisible Man/Zombie

The Invisible Man or The Invisible Zombie (as you want that it get called), would be a mob that only appears in the Mineshafts, it will slowly go toward you as any zombie, but the problem: you can´t see it!!! 

The only way to see it is to drink a night vision potion or to wait that he gives u 5 hits. When you can see it the design is as a palid zombie with globes and dark glasses.