New Brevoort Formspring

Hypothetical situation: As a writer, an artist asks me to write them a short (appx 4-8 pgs) script for their portfolio, specifying a Marvel character. I write the script, they draw it, send me the art as a .pdf or some such. Making no attempts to profit off this comic, and not intending it a pitch of any sort, but just as an example of my writing ability, can I send that comic to an editor at Marvel, or will it just get binned? Thanks!