This spell is mentioned in the cleric handbook but I seen no one else recommend it.
Tyche's Touch
Lost Empires of Faerun page 35
Cleric 2
Standard action cast, duration is 24 hours
or until all the 4 uses are used
Target gains a protective ward and gets a +4 sacred bonus on his 1st save he experiences after the spell is cast, +3 sacred bonus on his 2nd save, +2 sacred bonus on his 3rd save, +1 sacred bonus on his 4th save
There is also a curse option (which is less strong since you must do a touch attack and do a will saving throw) that is the exact opposite doing a penalty to saves.
Why wouldn't you want the cleric to have this as one of his 2nd level slots. The party will be buying multiple pearls of powers for themselves just like they should be buying pearls of power for magic vestment and greater magic weapon.
Once all 4 uses are used (or if you dismiss the spell) then just recast it for another +4 bonus to your saves.