Not much to say - 3x if you're doing a dedicated eagle deck, otherwise forget it. You'll probably have somewhere between 10-15 eligible cards, meaning you'll get at least one most of the time. It also has the Eagle trait itself, so you can chain them.
The Eagles Are Coming!
Event. Cost: 0.
Action: Search the top 5 cards of your deck for any number of Eagle cards and add them to your hand. Shuffle the other cards back into your deck.
"The Eagles! The Eagles!" Bilbo Baggins, The Hobbit
The Hunt for Gollum #5. Tactics.