Spectrasonic’s Omnisphere is the cheapest possible way to have a humongous library of really good sounds that you can manipulate dramatically. This is one of those "desert island" VSTs.
There are better specialist plug-ins in a lot of departments but this is an extremely good value. If you learn how to use this really well you can do almost anything.
I've used Omnisphere on nearly every track that I can remember, at least to map out basic ideas. I used it for sub-bass of "Make A Cake."