Original Creationist's comment:
So you are unable to furnish an observed example of a mutation creating a new relevant beneficial structrire
Maniraptoran arms modified into bird wings. You think evolution can do something that it can't. It's changes in EXISTING genetic materials. Why would you think a crocodile would grow a wing? That's not how evolution works. Why do you think evolution via a single mutation would give you a, as you say, "relevant beneficial structrire"? Is your comprehension of evolution so poor? No wonder you rant and rave against the evolution that lives in your mind - it IS quite silly compared to the real thing.
Another creationist's response:
bacteria don't have wings.