Kite Tenjo's Decks

Season 1
Kaito uses a Photon/LIGHT Deck, focused around Swarm and Beatdown tactics, centred around his ace, Galaxy-Eyes Photon Dragon and the "Number" series. His deck also appears to be focused on disrupting the opponents current strategy, making them have to come up with an entirely new one. According to Mr. Heartland, Kaito's Deck was made by him and Dr. Faker by using science from another dimension.

Collected Numbers
Prior to his first Duel with Yuma, he had already collected eleven "Number" cards As yet, it is unknown how many "Numbers" he possesses exactly, but after the mentioned Duel he was shown earning three more of them. Only four "Numbers" are known by name and it's unknown if he includes all collected "Numbers" in his Extra Deck.

Manga
In the manga, Kaito uses a Photon deck Supported by LIGHT cards. His deck is spearheaded by his "Galaxy-Eyes Photon Dragon" and currently has the same function as his anime deck apart from a few differences.