Your shield. Sorry for saying 'target shield' there.
Also, you can't play this on reflective shields though because that would just be dumb. I guess it would just not be playable if you had one up.
BTW, I am fine any of these ways, but do you prefer not negating momentum and 'SoFr' attacks or are you okay with it? Or should the upped cost 3 and negate momentum and 'SoFr' attacks? I just wanna know.
Edit: You can play it, but it would still be kinda useless.