Jack plays a Power Deck, featuring both Burn and Beatdown elements. He deals damage as fast as possible while attempting to Synchro Summon "Red Dragon Archfiend". His Deck is the opposite of Yusei's. Yusei prefers a defensive and adapting style, whereas Jack's is mainly offensive and punishes his opponents for defensive play, probably to show their rivalry.
Since the first season, Jack's Deck style has gone through a variety of changes. Over time, it has come to rely less on sheer power and more on strategy. His new Deck's "Blazing Soul" style focuses its strength into inflicting damage while at the same time swarming his field with Tuners to Synchro Summon "Red Nova Dragon" quickly. Like Yusei, he also has access to stronger cards such as "Majestic Red Dragon" for more intense opponents like Dark Signer Carly and Fake Jack. Jack has two Decks, one for Turbo Duels, and one for normal Duels.
As Jack was the King of Turbo Duels, he wasn't shown in any ground duels during the Fortune Cup, however he was shown dueling during his days back in Satellite when he was part of The Enforcers. He was also shown using holograms to keep people away from his part of Satellite as well as when he dueled Yusei.
Jack used a Power/Burn Deck based around his ace monster, "Red Dragon Archfiend". He also used various cards to show off his status as the King by letting his opponent get the upper hand, then quickly sweep them off their feet. He also uses an array of Trap Cards to maximize the abilities of his "Red Dragon Archfiend", by protecting it from various card effects and boosting its ATK. Jack used this Deck throughout his days as 'The King' as well as within the Fortune Cup tournament where he lost his title to Yusei Fudo.
After his embarrassing loss to Andre and acquiring "Red Nova Dragon", Jack shifts his strategy to being more flexible and less reckless, primarily focused on easily swarming the field with material for his "Red Nova Dragon" through cards such as "Tuner's Reflect" and his "Resonators". As well as this, he also uses several cards to negate effect damage like "Power Giant" and "Crimson Fire". Jack also uses cards such as "Monster Baton" to assist his team mates during the World Racing Grand Prix duels.
Jack later uses a Lockdown/Swarm Deck focused around the "Resonator" archetype which assists in helping Jack quickly swarm the field to quickly Synchro Summon his "Red Nova Dragon". Additionally, he utilizes several cards to punish defensive tactics such as "Power Pressure" and "Breakthrough". His Deck is also more flexible than before in terms that he can easily Synchro Summon Synchro Monsters other than his "Red Dragon Archfiend" or "Red Nova Dragon".
In the manga, Jack uses a "King" Deck based around Summoning his ace monster, "Dark Highlander". He also uses an array of Equip Spell Cards to maximize its power as well as to weaken the opponent's monsters thus maintaining him as the most powerful on the field, fitting in as his title of the King. He also utilizes the "Champion's" archetype of Spell and Trap Cards to further support his monsters.
In the English version, several of his "King" cards use the term "Lord" instead of "King".
↑ 15.015.115.215.315.415.515.615.7He uses this card during his Duel with Dragan. As their opening hands were identical in their original Duel for their rematch, it would have been present in this Deck as well