Baba Yaga

One of the most temperamental of the vehicles employed by Master Payne's Circus of Adventure, Baba Yaga was a wagon that had no wheels. Instead she had begin mechanical legs. She was apparently difficult to drive, constantly needing maintenance or refueling, and had a tendency to lean to one side when left standing for any length of time. But the Circus needed the eggs.

Agatha, as the newest member of the Circus, was given her (at least she got to bunk solo). Her plans for improvements were taken up by Dingbots, who eventually incorporated her into the Battle Circus.

The resulting Baba Yaga clank was able to fly, and successfully dispatched several Hoomhoffers before crashing. She happened to fall right on top of the Baron, effectively ending the battle.

Possibly Relevant Outside Information
Baba Yaga is the name of a witch who appears in many Russian fairy tales. She rides on a pestle (or in a mortar propelled by a pestle) and has a house perched on chicken legs.