Divine Arcanist (3.5e Feat)
From D&D Wiki
Divine arcanist [General]
you have been blessed by your divinity with the power to pull directly from the sunlight or the stars pure arcana magic, through your divine abilities
Prerequisite: Level 1 of the launcher, devotee of a deity with the dominion of the sun
Benefit: while in the sunlight You can exchange a spell that has been prepared for the spell in your spell list (or for sorcerers, outside your library) of the same level.
besides being considered a spontaneous conjurer (even when there is no sun), his class spells can be considered both divine and arcane for the purpose of any prerequisite (always)inspired by Spontaneous Casting( Eberron Campaign Setting, p. 61)
Normal: You're just a normal caster.