Dunedain Watcher is over-costed. Good, but over-costed. Three resources for one stat isn't good, but if the ability is worth it, than she's playable. And really, your paying for the built-in Hasty Stroke and the ally; which makes it two resources for for one, one, or one. Plus any effects triggering off leaving play like in-sphere Imrahil. She's also the spiritual ancestor of Dunedain Lookout, which is kind of cool.
Ally. Cost: 3. 1 1 1 2
Response: Discard Dúnedain Watcher from play to cancel the shadow effects of a card just triggered.
"If simple folk are free from care and fear, simple they will be, and we must be secret to keep them so. That has been the task of my kindred, while the years have lengthened and the grass has grown." Strider, The Fellowship of the Ring
The Dead Marshes #96. Leadership.