Hmm…Well besides Rumple lets look at all the magic users of ONCE (The Main Ones +Jafar)
Cora like you said had the Spark of Magic
Regina and Zelena had the gift of magic.
Jafar his anger kept him alive after he was drowned to death.
Emma The Product of True Love
Henry (This one’s a stretch) Heart of the trust believe, not to mention who he is related too
So I guess we can say magic is only for those special, for the main magic uses of ONCE are all unique and have shown off special qualities as far as I can tell. I might have missed something .
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