Wand Coupling is a Encounter power available to Wizards at 17th level[Dr380]
Wand Coupling
Wizard Attack 17
You release a blast of energy from your wand, and as that energy flows outward, it pulses briefly and brightly with a secondary surge of magic
Encounter ✦ arcane, implement
Requirement: You must be wielding a wand.
Target: One creature
Attack: Intelligence vs. Reflex
Hit: 3d6 + Intelligence modifier damage, and you push the target 3 squares. If your wand has an unexpended magic item encounter power, you can use that power as a free action.