Clive's Wild Valkyrie, but Not Swole?

Without Easy Mode, it's gonna be extremely hard to even use her. Her attack is low as it is, and -Atk will make it basically unsalvageable. Horse buffs make her at least somewhat usable offensively.

She is one of those units that can be useful when you merge them heavily. When you get more of her, you WILL get better IVs at some points.

I think she isn't 5Stars exclusive anymore ?

Feed her a Berkut Lance, and she can be a pretty decent tank.

Outside a cavalry team, without merges, I think she won't be viable, unless you give her TONS of expensive skills (with Triangle Adept and Distant Counter, she might be nice lol).