The caster sends her image through a mirror into another mirror or mirrored surface that the chosen target looks into.
Book of Vile Darkness 3.5
By Monte Cook
The caster casts the spell, then stares into her mirror until the target sees his reflection in another mirror, or until the caster tires and gives up. The caster can see the subject and his surroundings in her mirror whenever the subject looks at his mirror. From the subject’s perspective, the caster appears to be staring out of the mirror, replacing the subject’s own reflection or appearing right behind him (caster’s choice). The caster can have her image say up to one word per caster level before it disappears, if she chooses. The image remains for only 1 round. Subjects not expecting a mirror sending can be greatly unnerved by this spell.
Focus: A mirror of finely wrought and highly polished silver costing not less than 1,000 gp. The mirror must be at least 2 feet by 4 feet.