Dandu
First Post
Rainbow Servant causes you to lose 4 caster levels if you go by the table... but none if you go by the description. As the general rules is Text Trumps Table, not to mention the fact that there is no Complete Divine errata ruling on this, the RAW stance is that you have a 10/10 caster level advancement class.
Being able to spontaniously cast any cleric spell without using 9th level spells to replicate them is a tad overpowered when you lose no caster levels for doing so.
Considering the fact that a 17th-level cleric or 18th-level Favored Soul can emulate 7th or lower spells of any class via casting Miracle, I don't know if Rainbow Servant combo is overtly powerful.
Being able to spontaniously cast any cleric spell without using 9th level spells to replicate them is a tad overpowered when you lose no caster levels for doing so.