Page of Swords/Prefect of Slytherin: At first I was having trouble aligning this card to Draco Malfoy, as it's keywords are all things about ethics and honesty and justice. It is also about being analytical and refusing to be discouraged. But this little blurb from LearnTarot.com
really crystalized my understanding and made Draco feel like a good fit: "The Page of Swords is a messenger bringing you challenges. He suggests that an opportunity for growth may come your way in the guise of a problem or dilemma. These challenges may not be your favorites. In fact, you probably will want to say "Thanks...but no thanks."
The Page of Swords asks you to embrace these difficult situations. Think of them as trials designed to test your mettle. If you accept and prevail, you will become stronger and more resilient. In meeting these challenges, you are encouraged to use the tools of the Swords suit - honest, reason, integrity and fortitude."
What better way to describe the challenges that Draco is put through in his later Hogwarts years, tests set by Voldemort and various pressures of his family and house. While he falters at first, he eventually makes the right choices and (we can assume) ends up a much improved person for it.