Rigger

Rigger is a creature type and class. Riggers are creatures that specialize in the lifting and moving of extremely large or heavy objects.

Steamflogger Boss from Future Sight was presented as a Rigger lord, but at that time the only creature with the subtype was Steamflogger Boss itself. In the Grand Creature Type Update he was joined by Moriok Rigger.

Riggers finally returned in Unstable. These can all assemble Contraptions.