Mach

Mach is a character appearing in the Yu-Gi-Oh! ZEXAL anime. He is one of the Legendary "Number" Guardians with the role of protecting the Legendary Number. So far of all Number's Guardians, he is the only with Human appearance.

History
In the distant past, Mach was a pegasus who served a legendary hero. Three knights who lived in his land attempted to usurp the King, but were intercepted by Mach and his master. Since the hero was unwilling to kill his former comrades, both master and steed were eventually defeated and killed. However, the hero's fellow knights regretted their actions and they buried him and Mach together. Mach later became the "Number" spirit guardian of "Number 44: Sky Pegasus".

Yu-Gi-Oh! ZEXAL II
Upon entering a "Number" temple, Yuma was separated from Shark and the mysterious boy, Nasch who he saved earlier. After exploring the temple further, Yuma was confronted by Mach before he could grab the Sacred "Number" card that was contained in the temple. Mach then began a Duel with Yuma with Shark's and Nasch's lives on the line. As the Duel continued, Shark and Nasch eventually ended up finding runes which explained Mach's story and its relevance to his Duel strategy, which enabled Yuma to win the Duel. Afterwards, Mach entrusted Yuma with his "Number" card before disappearing.

Deck
Mach uses a "Druid" Deck focusing on a strategy of "Labyrinth of Decision" and "Unfair Treaty", which forces his opponent to pay the cost of "Labyrinth", which can lower Life Points very quickly when combined with the effect of his "Number", while also cutting the cards in his opponent's hand.