Haldir of Lorien is a pretty good (albeit much to generalized) ally. Four resources is way too expensive for two of something and three health. He also has the misfortune of having a much better hero version. Ranged and sentinel though, is probably worth it; and versatility is handy.
Haldir of Lórien
Ally. Cost: 4. 2 2 2 3
"But there are some of us still who go abroad for the gathering of news and the watching of our enemies, and they speak the languages of other lands." The Fellowship of the Ring
A Journey to Rhosgobel #57. Lore.
In a Celeborn/Silvan deck he's a rare powerhouse, and possibly the best result you can get out of playing Tree People. Even without that art he'd be a must-have for me. — Edheliad 19