Based on looking at Animated object, idea for a "caster" god class:
* Use Substitute Domain for spellcasting flexibility (perhaps from Alter Reality)
* Domain Magic a few times (with one of them periodically modified with Substitute Domain)
* Take Heretic of the Faith or Customize Domain to edit spell choice
End Result --> Very respectable caster after investing 1 feat & 4 Divine Characteristics & 1 Salient Divine Ability. Roughly 3 levels investment means that you can act like a full caster. (1 domain with frequent casting, 1 custom domain with frequent casting, Alter Reality). Reminder that these are SLA, meaning that spells are auto-stilled, silent (very useful for summoning or oracle spells)
feats: Apprentice (UMD), Heretic of the Faith or Customize Domain, Initiate of Mystra (cast in dead magic zone), Supernatural Transformation (?), Reserves of Strength (?)
Best,
David