Teleport is my soverign's most used spell. Next are the brilliance, etc on settlements. Next is the summoned bear as a companion for early exploring missions.
Tactical? The hurl boulder helps... havnt tried the other ranged damage spells.
(all ver 1.0x)
Comment: When the mana, magic system is in better shape, modding the spells to create real choices with trade-offs will be awesome. Not uber spells, but magic with an up side and a down side, so players continue to be challenged with interersting choices.