S.M. Vidaurri 
Iscariot [EPUB ebook] 

When Carson, a young girl living with cancer, is bestowed with age-old magic by a rebellious sorcerer named Iscariot, she must navigate her new powers, face the life she had thought she left behind forever, and take on the order of magicians who want to control her destiny. Carson discovers that Iscariot’s intentions might not have been as altruistic as it first appeared, and learns the hard way that magic comes at a cost.