Could scarlet witch beat panther, or does he have some magic resistance?
Also curious on whether he could take Thor or Strange
He did have magical resistance at one point in the comics, but I think that has been taken away.
There's no way he could take on Thor in a one-on-one battle. Waaaay out of his ballpark. BP would have to prep and plan ahead for any sort of chance just like Batman. Strange and Witch are insanely powerful, but still human at the end of the day, which makes them fragile and vulnerable. If BP can get in close and capitalize on an opening he could probably take either out. In Civil War, Rhodey disrupted SW with his high pitched sonar weapon thing.