The powerplay idea is simply a way to get more content and more action into every post. Instead of having to stop at "and then Sasuke thows his sword straight at Naruto" you can go ahead with "the blade slices through him like butter, victory is assured until he explodes in a cloud of white. A kage bunshin, the real one must be hiding somewhere..."

Normally (as in, this is my experience from gaming here) you have to either make a collaboration or have a long conversation with your player opponent or GM. If the rules of powerplay were a bit looser, you'd be free to make up certain things on the spot to create a better post. Of course, like my other suggestions, this one was developed in a safe environment and might not be well suited for an 'open' game such as yours. 

It's fine if none of my suggestions suit your taste. These are just some things I've been thinking about lately that would be fun to try out in a game. No hard feelings. :)