Martial Readiness

Heroic Tier
Prerequisite: Any martial class
Benefit: When you take this feat, choose one martial at-will attack power of your level or lower from your class. After an extended rest, you can swap the chosen power for a martial at-will attack power you know of the same level. You can substitute the original power back in after another extended rest.

Published in Martial Power 2, page(s) 137.