>>724537949
The deck isn't anything phenomenal. It's kinda garbage really. You could drop 200 wit on what I built for half that amount of stamina/power and it would be ideal. Biwa only has the early race heal as a relevant gold in this CM so you'll want either the event Special Week card or the event Daiwa card to gamble on a gold heal on top of having Creek around as a more reliable event. If you go with Special Week then get an extra stamina card and funnel your parent sparks into power. Kitasan isn't required, but the power bonus does help a lot.
You do need to highroll on her speed trainings, there isn't any other way around it. I'd recommend trying to get about 6 speed sparks and however many power/stamina sparks you can manage to get while retaining a decent chance at medium S. Ideally you want a parent with a lot of URA Finale sparks to help patch up speed and stamina. Wit trainings do add up fast thanks to the 20% bonus to wit, but you really don't need to aim for over 600 wit: some of those weaker wit trainings could be better used on stamina or power or even resting in preparation for it.
My Biwa is basically a late gambler in disguise that needs fading front runners to take advantage of and needs just about every recovery skill I crammed on her to survive debuffers. Not getting medium S sucks too since I had to abandon the ability to get Red Shift to gamble on it.