Zatch Bell!! - Vol. 8 Ch. 74 - The Fifth Spell

[MangaDex]

 

[PramTheOracle]

And so Kiyomaro’s and Gash’s adventures ended in the hands of the Chinese mafia

 

[Meduchi]

Zabas is a pretty funny character, he ended up getting trashed pretty badly this chapter so he clearly isn't a very strong demon, but his wings pretty much give him easy mode against most kids for the beginning part of the competition, so it's no wonder he was so confident at first.