Mysterious Repertoire Feat 14
Source Pathfinder Advanced Player's Guide
Your mystery holds unknowable depths of magic not always associated with the divine. You can have one spell in your spell repertoire not on the divine spell list, in addition to spells you've added to your spell list from feats like Divine Access. You cast that spell as a divine spell.
You can swap which spell you add and from which tradition as you could any other oracle spell, but you can't use this feat to have more than one spell from another tradition in your spell repertoire at the same time.
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
OracleThis indicates abilities from the oracle class.