Woo! Okay, I think Yoruichi might be physically stronger than Castiel, but of course she can't do everything else he can, so it'll likely come down to having to outsmart him. Do you have any plans already in place we need to account for?

If it comes down to her capturing him, she'd try to cure him rather than try to kill him--she's technically a god, so kidou healing might count as holy magic for this? It's up to you XD