Depends on what are you using her for, previously during the judgement ordeal event for ribbon, i think you might wanna use her for chain so dream within a dream. For guild battles and arena, I dont really recommend it.
which type of card should i use on shadowlymx agility or luck
I'm in the minority, but I like Dragoon. You get her speed mixed with the damage they can bring. Just make sure you don't target someone who will move before you attack. But usually the wait is only one or two turns later.
she should be rated as S tier, she has a better master ability than Kitone, she's great in PvE, She's very mobile, fast, has range attack, evasive, and good Damage. If you are farming, u don't really need to overkill an enemy, u just need enough dmg to 1 hit an enemy. Imagine having a unit that is fast and can move around the map easily that hits hard, u can clear a level faster and you can farm mats faster.
Sub dragoon seems fun since she is fast can attack very far.
Thou sub as samurai complements her ninja class the most since it's evasion and slash attacks too imagine shuriken and hien both range to your melee damage. Blade soul and shadow runner passive you won't regret.