Eagle Eye

You touch a willing creature (including yourself). Your magic grants the affected creature a brief insight into the target's defenses. The affected creature gets a bonus on one ranged attack roll within the next minute. The bonus equals the casters spellcasting-modifier. If the attack hits its target, the casters spellcasting-modifier is added to the damage roll as well. 

If the affected creature intends to use the attack bonus, the usage must be declared after the attack dice is rolled, but before determining if the attack was successful.