We adopted your house rule some time ago, and it definitely makes for some agonizing (and exciting) choices. I'm statting up my new 5th-level cleric for an upcoming Greyhawk game, and the most fun part has been choosing my spell list. Just look at the spells I dropped--my 3rd-level spell list is barely recognizable!Piratecat said:Because the beguiler automatically knows all spells that he has access to, be very, very cautious about adding any new spells to his list. I would tend to only allow a player to "swap" spells onto the list, eliminating an existing spell in order to add a new one. That's certainly a house rule (and one I use for adding new cleric spells as well), but it would help maintain balance better than adding spells freely.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.