Sure Strike

(Player's Handbook II, DnD 3.5)

Divination

Level: ; Duskblade 2; Sorcerer/Wizard 2
Components: V
Casting Time: 1 swift action
Range: Personal
Target: You
Duration: 1 round or until discharged

You gain a fleeting glimpse into the future, enough to guide your impending attack.
You cast this spell immediately before you make an attack roll.
You can see into the future for that attack, granting you a +1 insight bonus per three caster levels on your next attack roll.