Assume O-O...

Hi!

If you have a look at my stats (though I beg you, do not), I play at suck level. So at this level, I have experienced that 90% of the cases, people tend to castle king-side (I guess that is the most common anyway, but people just don't seem to realize that at times O-O-O is better, and go ahead with O-O anyway). So I'm looking for an opening that would take the most advantage of it, and would have a massive assault prepared at the castled king.
Thank you

After you find this non-existent opening I'll give you a map with the location of Ponce de Leon's Fountain of Youth in return for the name of the opening

Start concentrating on general principles (GPs) of openings, middlegames and endgames and don't waste time looking for non-existent tailor-made openings for situations that actually require you to know GPs such as utilizing open files, occupying the 7th-rank with a rook, being able to spot the possibility of a back rank mate etc etc

http://www.chess.com/blog/NimzoRoy/chess-opening-principles?_domain=old_blog_host&_parent=old_frontend_blog_view

http://www.chess.com/blog/NimzoRoy/endgame-faqs?_domain=old_blog_host&_parent=old_frontend_blog_view

So I just asked something dumb?

Yes, that seems to sum up NimzoRoy's comment. He's saying that you should learn how to handle openings in general since you cannot guarantee a setup like the one you are asking for.

Let's say unrealistic, not dumb. Tact isn't always one of my strong pts but I was trying to tell you something useful

What Nimzo was getting at is that there is no opening that will simply you give a massive attack everytime black castles kingside.