What's great about this Side Quest is that it's not limited to 1 per deck. You can run 3 copies of it to make sure you get the benefit as soon as possible, even without having Thurindir as one of your heroes.
The Storm Comes
Limit 1 copy of The Storm Comes in the victory display.
While this quest is in the victory display, the first ally played by each player each round does not require a resource match.
Gandalf, The Return of the King
The Sands of Harad #13. Neutral.
This is a very interesting side quest. While I think it is very underrated, it can be huge at times. For example, the other day I made a Harad deck with some of the cards I own and by getting this in my hand at the beginning of the game, it almost certainly means I can get a big ally out (like Firyal, Yazan, Jubayr) turn 2, which can be huge.
It's also a really good card to consider when playing a deck with three different spheres.
Who it works well with:
Thurindir because you can dig it out for the beginning of the game.
A deck that has high cost allies.
A deck which you use three different heroes of three different spheres of influence.
My opinion: 7/10