Since I really love amvs, I strive to collect as many of them as I can, particularly if they're Slayers-related. Sadly, for the longest time I could not for the life of me find one about Sylphiel. However, I did not give up hope and eventually one was made by Meliamay! :D Please go and download it since it's the -only- known Sylphiel AMV in existence.
Sylphiel's Monologue - by Meliamay