magic fencer cost has been reduced after rebalance, their stats become lower though
well, their cost is pretty low, you dont need to mincost her maybe aim for -3
i dont remember about new stages, but if you are talking about X and G difficulty daily
magic crystal X
https://www.youtube.com/watch?v=wG9uOnsAGSc
magic crystal G
https://www.youtube.com/watch?v=XH6lX1JwyNw
armor X
https://www.youtube.com/watch?v=p5zjxg8kOcY