After watching ep. 19, it doesn’t seem like Mr. Gold has magic the way he did before in fairy-tale land. August wasn’t able to control him by using the knife. Mr. Gold came to this world, a land without magic, because it was they only place he didn’t have dark magic. He has the appearance of a normal man in SB, even though he maintains his inclination to make deals like Rumpel did. Also, Mr. Gold commented to Regina how frustrating it was that one cannot simply turn your enemy into a slug and squash them in SB. However, I do think Emma has magic, like Jefferson said in episode 17. I think she created that magic hall, which Jefferson fell into and out of SB.
"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy