Question about copyright law & the GW Halloween contest

So I had an idea to enter this contest with, but I have no clue how to find out if it infringes on any copyrights.

A good example to use here would be the American Express commercials, where they have some celebrity ranting over a cityscape and finish off with, "This is my city. This is my card."

If I were to adapt that T.V. commercial concept into Guild Wars, would it be copyright infringement? Am I stepping on any intellectual property toes? Or does it fall more under the Fair Use guidelines (not for commercial use, etc., blah blah, and so on)?

If someone from Anet could respond to this that'd be fantastic.

Get in contact with Anet/NCsoft. Nothing anyone here can do for you except speculate.

Closed.