C2 Dragon
Fly on a dragon for 4 seconds, moving at maximum speed, becoming untargettable and dropping bombs below you every 0.3 second dealing 0.3*power damage in a area.
I think there are some jutsus that will already do that. Since clay will probably be a clan like windies that shoot projectiles out and run around; I'm guessing they'll be able to get a 30 speed build, which won't require them to stay on a bird and use that for speed.