I know Ozzy made "I am Iron Man" and someone re-did that and have one of it being "I am Santa Clause"... Santa Clause in it sounding robotic. I have the song on my computer.
The song is called Iron Man. In my opinion, I think that's the best song by Black Sabbath. Mr Crowley's a great song. I think Crazy Train is better, though. That, in my opinion, is his best song, Sabbath, or solo.