Innate Spell( Complete Arcane, p. 80)
You have mastered a spell so thoroughly that you can now use it as a spell-like ability.
Choose any spell you can cast. You can now cast this spell at will as a spell-like ability once per round. One spell slot eight levels higher than the innate spell is permanently used to power it, and any XP cost for the innate spell is paid each time you use it. As well, you must have any focus required by the spell in order to use it as a spell-like ability, and if the innate spell has a costly material component, you must use an item worth 50 times that cost as a focus. Since an innate spell is a spell-like ability and not an actual spell, a cleric can't lose it to spontaneously cast a cure or infl ict spell. As well, spellcasters who become unable to cast spells of the level of the spell slot used to power the innate spell become unable to use the spell-like ability.
You can choose this feat more than once, selecting another spell and paying the spell slot, focus, and material components costs each time.