I don’t think Regina has the power to remove a heart in the real world. We saw that only in FTL, but we have only seen the huntsman so far. Who’s to say she doesn’t have PC’s heart or SW’s heart or whoever. We certainly have only seen a handful of her interactions. Although, I don’t know if you could feel true love without a heart. That will be a real twist if she has the power to remove hearts in SB. But so far, all I’ve seen in the “real” world is a lot of manipulation and whatever she brought with her from FTL, no supernatural powers for her or Rumpel so far. No moving plants, or poofing into smoke. The FT characters seem bound by the natural laws of our world so far — above ground.