At the BN Teen blog, Jenny Kawecki tagged "five YA novels in which every action has an equal but opposite reaction—especially magic," including:
Carry On, by Rainbow Rowell
Simon Snow is the worst hero ever. He’s just beginning his last year at the Watford School of Magicks, and he should be focused on figuring out how to get his powers to stabilize so he can finally defeat the Humdrum.
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» Five fantasy novels in which magic has a price