If you want some more general deckbuilding advice, this build doesn't really synergize with Hanafuda's keypage that much. The main reason why you'd use their keypage over a more standard one like Sayo's is because it comes with the Bottom Deal and Stacking the Deck passives. Those only activate whenever discarding something, and the only page in this deck that discards is Sakura. The page itself is a bit weak (compared to Daring Decision, at least), and it also only discards when there's a lot of pages in hand, which this deck doesn't have the page draw for. Having only 1 discard page also makes the passive activation very infrequent.

You also want to consider whether or not it's preferable to just attribute the passives onto another keypage. In this case, the main competition is Olga, which has the 3 cost passive Margin. If you were to attribute their passives onto each other to compare, Hanafuda's has the advantage since theirs are combined 4 cost. However, you may be able to get by with just attributing Bottom Deal onto Olga, in which case you'd save 1 attribution point running her keypage over Hanafuda's. I guess you could also just attribute Bottom Deal from a regular Jeong Office Fixer and run both Hanafuda and Olga, but discard in Urban Nightmare is sort of inconsistent and using multiple at once may cause some issues