Board Thread:General Discussion/@comment-7014539-20140412191511/@comment-8345449-20140413150700

My vote would have to go to Nyx for the top spot - she created the Genies whose powers could grant wishes, and when combined together, could even break the laws of magic.

And after her:

2.   Zelena - according to Rumple, she is a lot more powerful than Cora (and Regina obviously). And Regina implied that Cora was powerful enough to give Rumple trouble. 3.   Peter Pan - Rumple keeps stating that to defeat him, he has to give up his own life, so Pan has to be at least equal to Rumple in power and probably slightly more so. 4.   Rumple - he is the Dark One and everything, although I think he would lose to the 3 above him for the reasons I have stated. 5.   Cora - Regina and her are probably close in strength but I think Cora has the edge because she is more experience and well, more heartless. 6.   Regina/Maleficent - their only fight onscreen showed they were pretty much well-matched 8.   Jafar/Amara - same as above. 10. Anastasia - Jafar seems to be able to easily overpower her and she is obviously afraid of him.

This list does not take in account the brief period when Amara and Jafar gained the powers to break the laws of magic, else they would be at the top, just below Nyx.