Read the description for episode 17. It describes Jefferson as a “man of magic.” He doesn’t have magic in SB, nor does Mr. Gold, nor Regina, because the curse brought everyone to a “land without magic”. They only have as much magic as they have magical objects that they brought with them from FTL (e.g. Regina’s magic ring). They can’t create more magic in SB out of nothing.
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"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