As storm, wild bolt is fun but leaves a bit of room for improvement and as such I think at level 56 or so storm school should be given a free wild bolt upgrade.
The new card would be Improved Wild Bolt and for a cost of three pips it would do a base damage of 1400 plus stun with a base 10% casting accuracy. I came up with the 1400 base damage based on the 500 damage per pip that wild bolt does and subtracted 100 points of damage from it while adding stun.