You send your familiar in to keep your opponent off balance.

At-Will   ✦     Arcane, Teleportation
Move Action  

Effect: Teleport your familiar 10 squares, and until the end of your next turn your familiar can flank with you or your allies. When an attack hits a creature flanked by the familiar, that creature cannot shift until the end of its next turn.

Published in Dragon Magazine 382, page(s) 26.