Whats the best sealer for black iron delivering natural gas? I have to move a line for the stove pretty soon. Not much pipe, I was thinking tape wrap with a touch of thread seal but have been too lazy to Google the requirements.

Actually, I'd more trust an opinion delivered by someone here.
They make tape based coating systems for pipe. Polyken is the brand I'm familier with...you can do a web search to find a vendor. It generally consists of a can of primer (a thick, black, sticky product) and rolls of special tape designed to work with the primer. If you go that route you need to bond the pipe to an anode (either zinc or magnesium) to protect coating holidays (voids) from pitting. IF YOU DON'T use an anode, you'd actually be better off just burying bare steel, as then your corrosion will be uniform and not concentrated at one area. A coated steel line with no anode will rust through much faster than a bare steel line.
The garden hose comment is classic. I'm betting sometime during this cold-snap one of two things will happen:
1. The hose will crack due to the cold resulting in a major gas leak.
2. The poster will come home and find his water pipes frozen because the gas company saw the hose hooked to gas and shut off and locked the meter on a major-safety violation.
Come to think of it...I bet both 1 and 2 happen. The hose cracks, a passerby calls 911 because they smell a gas leak, the FD rolls in and finds the problem. They call the gas company and the gas company shuts off and locks the meter. Quite predictible.
You know those red neck jokes..."you might be a red neck?" Well...here's mine....
"If your gas piping includes hose clamps? You might be a red neck."
Phil