From Yu-Gi-Oh!

Mr. Ryuga is a teacher trainee assigned to duel fifty students in Duel Academy. On the condition that he could pass them all, he would be recognized as an official professor of the school. He is rumored to take the cards of those he defeats. When he duels, he uses a special ring to emit an electromagnetic force that disables his opponent's Duel Disk, preventing their use of Spell Cards. He challenges Jaden, but the duelist defeats Ryuga with his Trap "Alternate Fusion" card.

Deck

Ryuga uses a Dinosaur Deck, which utilizes the brute force of monsters such as "Cyber Dinosaur" to defeat his opponents.