Seems like a simplified Mononofu so far, which is nice because Mono was incomprehensible at launch. Like Sema said, not needing multiple copies of 5* units is real nice. At least initial Evolving is very attainable and Awakening seems doable.

I can't seem to figure out how Skill Cards work though. When I upgraded a Samurai with a copy of herself, it would skill up but using the 4-star Skill Card in Power-Up had no results for me. Is it a chance based thing or do you need to modify the skill card first?