I don’t think Emma will become corrupted by magic. Rumple, Regina and Cora rely on magic to solve all their problems whereas Emma is capable of solving her problems without it.
Emma’s magic activated when she saved Snow from Cora and when she was trying to find out the truth of Archie’s “murder” for Regina’s sake. Both times Emma used magic to help someone else.
I don’t think Emma can use her magic in the way that Cora, Rumple and Regina can use theirs.
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All magic comes with a price!
Keeper of Felix