Vhane said:I'm looking for a way to cast 2 - 4 low level spells with a single slot. Three level one spells at once would take a fifth level slot.
Note that the contingency spell already does most of what you want, albeit limited to one spell. The chain contingency spell from T&B would seem to fit the bill perfectly. It's also 9th level, so that should be an indication of how powerful this ability is.