houserules - random magic ?

without ever having playtested it ...

I was thinking that it might be interesting to play with a rule that instead of having "fixed" spells ...simple recond the number of spells of a magic user and then roll them over for each battle. - why ? Because it would make the games more flexible ...forcing you / enabling you to try your hand at different spells in different games and incidently helping out those poor sods who always roll the "worst" spell on their lists ....CON: well obviously it gets a bit harder to tailor you band to a strategy based on a specific spell such as the "animate zombie" or whatever its called?

what do u guys think?