If it’s brain, courage, heart, that’s three elements, which is similar to how they changed the laws of magic in WL, with three Genies. Each of those three Genies could maybe be classified as one of the three elements Zelena needs – Cyrus had bravado, so he’s the courage, his older brother seemed to be the stern, worried one, so he’s the brain, and the younger brother just seemed like a sweet kid, so he’s the heart. So maybe Zelena is basically just trying to cast the same spell as Jafar and Amara.
I’m glad you brought up WL because as I was watching, I kept thinking “this isn’t how you change the laws of magic.” So I don’t know what Jafar needed 3 genies and Zelena needs courage, heart, and brains.
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"He was a lot of things to me" "The only conclusion was love"