Otohime... that might be a good choice for a Card down the road... oh wait.
Still not there yet.
Let me try to set you down a path. Usually the text of the clues is pretty irrelevant to guessing what the card is. At least, that's been my pattern. For Des Volstgalph and Otohime, yes there was some clue in the text but otherwise I gave you the answer right there in the clue. Now there may have been the blatent misdirection if you took what I wrote literally, and then the subtle misdirection in that while I made the answer "obvious" if you knew where to look, the "where to look" was far more subtle.
For D.D. Crow, the answer was pretty much given in the lovely Wikipedia link that Entropy posted about Morrigan. "Where to look" in this case was handed to you.
So now you were given a song. The earlier 2 text clues were lyrics to this song. But I already said the lyrics were a deliberate red herring. The song though has to have some relevance. After all, if I stay true to form then once you remove the layers of deception, would I not have given you the answer outright as well?
So maybe there are far fewer "cross-genre" people out there than I thought. But this is the Internet. Given the little bit that you know, how hard would it be to uncover more about what is known to reveal some things I haven't said... after all, you should appreciate the effort I had to go through to remove the MP3 tags from the original song.
With that, I leave you to your task should you decide you want to solve the riddle badly enough. The answer can be reverse engineered from the bits you do have (I just double checked it myself). I might even leave a shortcut hint in the process...
In the meantime, I will finally go back to my fantasies of Yuriko Shiratori, Rina Akiyama, and Wakana Matsumoto.