From the Dragonlance books.
https://dl-war-of-the-lance.obsidianportal.com/wikis/dragonlance-campaign-feats
Dynamic Priest [General] (Legends of the Twins)
Your self-confidence and force of personality are the foundations of your faith.
Benefit: For the purpose of determining bonus divine spells per day and maximum divine spell level, your primary spellcasting ability is Charisma. If you have more than one divine spellcasting class, the bonus applies to only one of those classes. Your spell save DCs are not affected by this change.
Special: You may only take this feat as a 1st-level character. If you take this feat more than once, it applies to a different divine spellcasting class each time. You may take this feat even if you have no divine spellcasting classes yet.