Hmm... Rumpel's dagger so I could control him and make him be with me forever!! *evil laughter* xD Ohhh and Graham's cœur, coeur would actually work for the same purpose too with him lol. No, no wait...I also want the magical hat which gets toi to different worlds!! Yep, that's my first choice:) haha
I would steal... Henry's storybook to read all the stories again and again, a magic spell book to learn magic though I would use it for good not like Regina, Ariel's bracelet so I could become a mermaid, and Emma's yellow bug because it is awesome and super cute.