You might also want to ban Forcemaster, or at least [mwcard=FWE05] Forcefield[/mwcard]. Or is it just assumed that everyone will have a Dispel/Disperse with "Use against Forcefield" written on it?
Have you considered shrinking the Arena? Maybe 4 zones in a square? Or any other ideas you could more-or-less port from Academy? Apprentice-sized spell books (e.g. 40-60 spell book points) might be a good idea, as that will reduce the number of available counters and back-up plans one can bring.
On second thought, 4 zones might make turn 1 Wall of Thorns/Force Push a little too easy/strong. Unless you also ban walls (?). Or use a 9-zone square (e.g. just shave a column off the standard board). A 2x3 board could also work, as that would still have the mages start range 3 apart... although "Move + Wall, Push" would still be possible on turn 1 with initiative.