Lazar's balloon is a yellow smiley faced balloon device used by Lazar to make escapes.
The deflated balloon is kept inside his sleeve. When in danger, Lazar slides the balloon out, where it starts to inflate. He then clings onto its rope, while it carries him to safety.
The Three Pure Nobles trapped Lazar and Yusei in a warehouse, where a bomb was planted. Lazar used the balloon to soar away from the explosion and carried Yusei with him. He let Yusei drop once safe to do so and continued to fly away himself.