Rider Cards

Like the Heisei Riders in Kamen Rider Ryuki and Kamen Rider Blade, Decade has card-based weaponry and powers: the Rider Cards (ライダーカード). However, due to a seal placed on them all, Tsukasa travels across the world to undo the seals and regain the abilities the cards endow. These cards match up with Bandai and Carddas's arcade card game, Kamen Rider Battle: Ganbaride.

Like Decade, Diend possesses his own set of Rider Cards.

Card Types
KamenRide= The KamenRide Cards (カメンライドカード) supposedly possess all the powers of the Heisei Kamen Riders it represents, along with Shōwa Kamen Riders as seen in Super Hero Taisen. Because they were sealed, Tsukasa must touch the heart of a world's Kamen Rider in resolving an issue threatening that world. Though he regained his abilities from his journey, the KamenRide Cards went black while fighting Dark Kiva, but were regained later on. It seems the cards are more than just items that supposedly hold the power of the Riders as they sealed themselves until Tsukasa did something which helped the respective A.R Rider as well as learned a lesson from them, implying the Rider Cards hold some degree of sentience. It should also be noted that the cards may not unseal themselves until someone other than Tsukasa holds said cards as shown when the Skull card automatically unsealed itself after being given to Shotaro.

Diend uses his KamenRide cards to summon other Kamen Riders. Diend is not limited to just the nine previous primary Kamen Riders, but has access to any Kamen Rider who has appeared in the Heisei period. The cards of the Extra Riders, including his own, differ from Decade's main nine cards using a white background as opposed to a black one. Eventually, Diend is able to summon Riders from the Showa period as well. Diend has summoned, at most, three different Kamen Riders at once. Diend may have more cards that were not shown.

When Kamen Rider Decade is in his Complete Form, he uses the K-Touch to summon the Final Forms of the previous Kamen Riders. After he presses the Rider's symbol, a card of that Rider's Final Form appears in a set of nine on Kamen Rider Decade's chest.
 * -|Complete Form=

Diend owns his version of a K-Touch, though it is unknown what would happen if one of the buttons were to be pressed, though it would most likely summon A.R versions of the movie-exclusive Kamen Riders on the K-Touch.

KaijinRide Cards (カイジンライドカード) allow Chinomanako Diend to summon Kaijin from previous Kamen Rider series. Given that Chinomanako had this set, it is possible that Kaito also had these in his possession.
 * -|KaijinRide=

These two cards were released as a bonus for preordering the Complete Selection Modification Decadriver alongside the KamenRide: Diend card and its corresponding Rider Card set, but using them will result in an error sound.

FormRide Cards (フォームライドカード) allow Decade to assume any of the forms the Heisei Riders have. Accessing these forms also grants Decade the use of any weapon exclusive to that form, such as the Storm Halber of Agito Storm or the Bassha Magnum of Kiva Basshaa. When using Kuuga's FormRide Cards, Decade gains Kuuga's ability to turn normal items or weapons into their respective weaponry.
 * -|FormRide=

Generally, Decade changes forms within one Rider's forms. However, Decade does not have to be a particular Rider to transform into one of that Rider's alternate forms.

The AttackRide Cards (アタックライドカード) allow Decade or Diend to perform any of their own attacks.
 * -|AttackRide=

Decade is also able to use any signature attacks of whatever Kamen Rider he has transformed into.

Final FormRide Cards (ファイナルフォームライドカード) gives Decade the power to bestow new forms upon other Riders by reaching into their back, telling them beforehand "It might tickle a bit". Only while the cards stay in effect, which is during the time Tsukasa is transformed into Decade, the transformed Heisei Rider can alternate between his new form and his original Rider form.
 * -|Final FormRide=

Diend also has his array of Final FormRide Cards. Whereas Decade activates the Heisei Riders' Final Forms by reaching his hands into their back, Diend activates them by shooting the Rider in the back, commenting beforehand "This will only hurt for a moment."

In the OOO, Den-O, All Riders: Let's Go Kamen Riders: ~Let's Look! Only Your 48 Riders~, while playing poker and getting a "pig hand", Kamen Rider Decade uses Final FormRide Cards to transform his opponents—Garren into hishi mochi (菱餅), Chalice into a heart-shaped chocolate (チョコ), and General Shadow into a fishbowl (金魚鉢)— before taking all of their poker chips.

The Final AttackRide Cards (ファイナルアタックライドカード) are Decade and Diend's most powerful attacks, used for finishing off enemies.
 * -|Final AttackRide=

The Final AttackRide Cards, if used in conjunction with the Final FormRides, can allow Decade or Diend to perform an attack with that Rider's FinalForm (which usually resemble that Rider's own signature attack in some way). If the Final AttackRide is used in conjunction with KamenRide Cards, they allow Decade to perform the signature attack of the Rider he is transformed into. If the Final AttackRide is used when Decade is in Complete Form, he can perform that Rider's signature move (in their ultimate form) alongside the summoned Rider using the Ride Booker to improvise if the attack uses a weapon.

Unused Rider Cards

 * AttackRide: Cassette Arm

Wizard
The Rider Cards, along with the other Rider Powers, were stolen from Decade by Amadum in the world within the Magic Stone, who explained that they were already his due to the Riders' powers being from the same source as evil. However, the power was soon returned thanks to the appearance of Kamen Rider Gaim, with the return of the Rider Cards immediately transforming Decade into Complete Form.

Damashii
The power of the Rider Cards can be channeled through Decade Damashii and by extension Heisei Damashii; Kamen Rider Ghost rode on manifested Rider Cards during his battle against Dark Mind Alexander.

Influences to & from Super Sentai

 * The "KamenRides" preceded the of . Like the KamenRides, the  could transform into any past sentai.
 * However, Super Sentai came first with heroes transforming into past heroes in, who appeared in  (2006). AkaRed had the ability to transform into past , he also appeared in Gokaiger.
 * In the same vein, the Final FormRides preceded the of  as like the Final FormRides, the  could transform some past Red Rangers into weapons based on their motif. The transformation, however, isn't nowhere near as graphic as in Kamen Rider Decade.
 * A nod to the Final FormRides previously occurred in of Gokaiger, where, having Gokai Changed into  from , changed from its humanoid form to Sacred Sword Mode, expressing discomfort both during and after the transformation, while the original Zubaan in Boukenger was not a human but the Golden Sword  itself, being able to assume a humanoid fighting form when the seal on the sword was turned.
 * The Rider Cards of Decade and the of ' were noted by Narutaki as one of the similarities between Decade and Gokaiger in the ' net movie ' '.
 * The design of the Rider Cards are similar to PreCards from the 2014 anime series Happiness Charge Pretty Cure! (coincidentally also a 10th anniversary season), both have a barcode on a side and a magenta border. Both are also used to access forms and powers of the main protagonists's abilities.