I agree. I think it is most likely Rumpel because of the dark red magic. Maybe Rumpel being controlled by someone with the dagger. Or just the personification of the dark one power separated from Rumpel. Then they could hopefully get rid of the dark one curse for real, this time. It could be Jafar, but that doesn’t make sense to me. He is not Emma’s nemesis. For me, if it is anyone it is Rumpel, not the Evil Queen. That was what was always interesting about Swanfire. The daughter of the light with the son of the dark. Both from such different backgrounds, but still lost children. The show has always been Rumpel vs Emma. At least, for me.