Packed with 0-cost events that Gandalf can play when on the top of the deck, this deck is designed to maximize the benefits of Council of the Wise. On most rounds, you should be able to choose at least two of the benefits from Council of the Wise, between playing events in hand, those on the top of your deck, and using Galadriel to reduce your threat and put a new card on top of your deck.
Lots of excellent 0-cost event cards are Silvan based, so Celeborn is included to maximize the benefits of these Silvan allies, and this is really a different take on a Silvan deck, which has so many fun allies it's hard to choose which to bring. We'll bring most of them this way, but only one of each. There are also many doomed cards, which have even more benefit when you can reduce your threat by one immediately after playing them, essentially discounting the doomed keyword.
There are too many pieces to really have a core strategy here beyond playing as many events as possible, but each card is designed to be helpful in many circumstances. Just don't be afraid to seize control from the encounter deck by playing Host of Galadhrim before you have all your allies out; seizing control now will help much more than getting overwhelmed.