*I gather wind chakra to my left hand and start to make it spin at high speeds. I keep adding more chakra and increasing the speed, making it more dense until a small sphere of wind chakra spins with great speed in my palm, making a slightly hissing sound*
Pluses:
no hand seals, good damage, high speed, can be used in creative ways with taijutsu and kenjutsu, overall an excellent melee attack.
Negatives:
Not a projectile, short range, can't counter many jutsu, weak against fire, as the user has to get so close to the enemy, it leaves him open for attack.
The jutsu works in the same way as a normal rasengan: you compress a big amount of chakra in your palm and make it spin in all directions at high speeds, forming a small sphere in your palm that you punch the enemy with. This version is made using not regular chakra, but rather Wind Nature chakra, giving it a more slicing ability rather than the normal "punch/explosion" characteristic of the normal rasengan.