Leo uses a "Morphtronic" Deck. One of Leo's primary tactics is to use his "Magne-Lock" combination, using two copies of "Morphtronic Magnen" to prevent his opponent from declaring an attack. He then uses cards such as "Morphtronic Datatron" to inflict effect damage. However, under the advice of Yusei, Leo stops relying on this combination and later develops several other strategies, such as utilizing his "Gadget Hauler" to inflict large amounts of damage. Leo later acquires "Power Tool Dragon" and with it, an array of Equip Spell Cards to enhance it's abilities, primarily with "Double Tool C&D" and "Break! Draw!". Leo also uses several cards to regain Life Points such as "Power Converter" and "Damage Eraser". During his Duel with Aporia, Leo acquires "Life Stream Dragon".
|Devack||47-51||Win (with Luna)|
|Lester||77-78||Lose (with Luna)|
|Aporia||141-143||Win (with Luna and Jack Atlas)|
- This card can be seen when he looks through his Deck in episode episode 18
- Leo obtains this card in episode 142 from the Crimson Dragon after his transformation into a Signer.
- This card can be seen in his hand in episode 15.
- This card can be seen in his hand in episode 13.
- This card can be seen in his hand in episode 70.
- This card can be seen in his hand in episode 48.
- This card is Set in episode 78 but isn't activated.