Other then Attack Ride Cards, how else do the Kamen Ride Cards help Decade?

[Kamen_Sentai]

One more question; how come in some episodes, when fighting a monster, Decade transforms into a Rider and doesn't use any Attack Ride Cards? Like in episode 15 he tranformed into Kiva while fighting the Gator Imagin and in episode 24 where he tranformed into Den-O while fighing Chinomaniko. Do the Kamen Ride Cards give Decade some kind of power-up or something?

i guess that's for the fans. is a guess

but yeah, if not then...yeah maybe he does get a power up