The next question is what is Ral Zarek's role in this set? Little is known about this Planeswalker other than he first appeared in the Duels of the Planeswalkers expansion set with the 'Cloudburst' deck; and was a former guildmage for the Izzet League. As former versions of Izzet Guildmages involve copying instant or sorcery spells this could be one of Ral's abilities - although Chandra, the Firebrand already has a copy ability.
The Return to Ravnica players guide makes a passing reference to Ral;
"Ral Zarek is loyal to the Izzet League, but his ability to planeswalk is unknown even to the powerful dragon guildmaster Niv Mizzet, who has recently sent his guild into a frenzy of research and projects that no one seems to understand but him."
John of Team Gambit