This is a very straight-forward deck: mulligan for Nenya or Mirror of Galadriel (to dig for Nenya). With 2 mulligans and Mirror of Galadriel digging an extra 10, as well as a potential Song of Wisdom+Drinking Song it should come up most of the time. Declare rosie and frodo as questers, activating frodo's ability to ready rosie and Power of Command to raise . Use Nenya on rosie and rosie on frodo or herself. Quest for 19 from the first round.
Use Mirror of Galadriel, Master of the Forge and Expert Treasure-hunter for draw, Resourceful and Love of Tales for resource generation.
Use Fireside Song and all the songs, as well as Strider and Silver Circlet to boost Galadriel and Rosie Cotton's . Since rosie can boost herself, any buff on galadriel or her is practically doubled.
Include in any fellowship to solve from round 1 to the late game without taking up commonly used heroes or any relevant unique. The One Ring can be swapped out if necessary.
with enough Fast Hitch rosie and frodo can also defend one big attack, or if a sentinel defends it kill something chuncky (Master of the Forge can also be sacrificed once we got going). because rosie and galadriel's abilities can be used reactively, on rounds when there is not much need for rosie can boost any hobbit on the table and galadriel can use her natural ability. with frodo, galadriel and elrond's counsel we can stay in secrecy for a while, and if threat becomes tense accross the table we can soak it up with Song of Eärendil. Because of strider and rosie being and receiving Resourceful, losing frodo is not a big deal. Because rosie's ability can be used on any attribute we can still quest for 9/10 minimum in a battle or siege quest, while using frodo's ability on someone else's fighter.
sideboard includes cards that can come in according to the needs:
if no one is using Steward of Gondor, use it along with Blood of Númenor, Dúnedain Signal and Fast Hitch to make Rosie Cotton into a defender.
Gaffer Gamgee lets you Feint an attack every round, then kill with double Fast Hitch from Rosie Cotton and Frodo Baggins.
Warden of Healing and A Test of Will can come in if the quest needs it and the other players cannot provide.
Celebrían's Stone is an extra Silver Circlet if no one needs it.