I was thinking to rank for a keyword that shows absolutely no results on serp. Basically, I'm going to create 10 properties or more, every single property having just one different element. E.g: one wordress.com with 500 words, and 2% kw density, another one with 500 words and 2.5%. This way I'll be able to see which one is superior right from the start when they'll get index. What do you think?