Kite Tenjo's Decks

Anime
In the anime, Kaito's Deck focuses on the LIGHT-Attribute to swarm monsters, which he can then use to Xyz Summon his "Number" monsters. According to Mr. Heartland, Kaito's Deck was made by him and Dr. Faker by using science from another dimension.

Prior to his Duel with Yuma, he had already collected eleven "Number" cards, but after defeating Jin, he earned 1 more, possessing twelve. Only three of them are known by name and it's unknown if he includes all collected "Numbers" in his Extra Deck.

Manga
In the manga, Kaito's Deck seems to be more centered around the "Photon" archetype, whilst supporting them with the various "Number" cards he has obtained by beating Duelists.