I can see the summon spell being useful.
Towards the end of my dynasty there were very few teens around who were not paperboys or babysitters. Try as hard as I could, but I could never seem to locate these sims after school hours to build a relationship with my current dynasty heir. It was particularly painful if the relationship was neutral because they would constantly turn down invitations to get together - so there was really no way to spend time with them other than throwing a party, and that would cause my game to lag so badly it wasn't playable. It would have been awesome to be able to summon them.