You reach into the weave of arcane energy and exchange the magic of one spell for another.

Encounter   ✦     Arcane
Minor Action      Personal

Effect: Choose an unexpended wizard daily utility power that you have prepared. You instantly prepare a different wizard daily utility power in its place. The new power must be from your spellbook and of the same level as the old power.

Published in Heroes of the Fallen Lands, page(s) 220.