Descendant of Thorondor is not the best of the eagle cards, but it's still pretty good. Honestly, four resources for two attack is a steal, but eagles are expensive! It's ability is limited to the staging area, so it's not what it could be; but is pretty cool with sneak attack or meneldor's flight. I could see myself putting him in a deck.
Descendant of Thorondor
Ally. Cost: 4. 1 2 1 2
Descendant of Thorondor cannot have restricted attachments.
Response: After Descendant of Thorondor enters or leaves play, deal 2 damage to any 1 enemy in the staging area.
The Hills of Emyn Muil #75. Tactics.