Mach Tornado is the name of Meta Knight's neutral B attack. The tornado also appears to be significantly larger than the Mario Tornado, Dr. Tornado, and Luigi Cyclone. It appears to be based on a similar attack that Meta Knight uses in Kirby Super Star. In a video posted outside of the Dojo, we see mostly how this attack works. It appears to last for about 3 seconds, with Meta Knight being free to move while performing the attack.