I've been messing around with my Infinite Castle Strategy based on getting Maya's SA off as soon as battle starts with the intent to one shot every Floor. So, I figured why not try focusing solely on boosting her SA.

I start IC by sweeping to 40 and then using all the Stars to purchase Attack, Secret Art Damage, and Critical Rate up to 30% if possible. Once I get all 3 to 30% I start focusing on getting Critical Rate to 42%, then Secret Art Damage to 42%. This usually gets me to around Floor 60ish or so by this point. Then I typically finish off with 48% Critical Rate.

This is purely a Glass Cannon strategy and relies on RNG for Critical Hits, however with this Strategy I have one shot Floor 65 multiple times. Also, I should note I started this Strategy at 21K Attack for Maya, and that I only do the Nightmare Difficulty for 9 Stars as well as only buying 6% upgrades.