Omniscient Guardian Eye

create a mob that looks like a evoker which has the following appearance: ' Make a AI mob that can do anything. I say that is a bodyguard to me and protect me whatever and all I have to do to control him is type in chat because he has AI so he can build and do whatever.' and the following behavior/capabilities: 'It should have a eye in it and always follow me and do whatever I type in chat'