There are many such as clan wars, and the classic "jojo3000" lure. They are always changing as people learn about them.
sorry to butt in, but how do you do the clan wars one?
I doubt you will get any "effective" idea's, considering people DON'T want to leak there methods for FREE! Try searching around the guides section for something, maybe you will find a good guide there.
It's pretty easy to figure out most of them if you just watch some vids on Youtube.

