He is a duelist who uses a deck made of Tool monsters.
Cards
Stereo Tool
Hammer Tool
Copter Tool
Drill Tool
Skydiver Tool
Tool Repairment
Broken Tool
Hammer Little Hit
Hammer Hit
Speed of Sound
Tool Supply
Tool Fixer
Tool Handle
Driver Tool
Trigger Tool
Knive Tool
Screwdriver
Technique Management
Multirepairer
Macrorepairer
Carpenter's Master Tool
Superrepairer
Melted Gold