The Wastes of Eriador spoiler got me thinking about threat reduction and manipulation. One card that comes to mind is Song of Earendil.
My first question was whether or not you can use Song of Earendil with Wandering Took to raise your threat by X and lower someone else's threat by X. That question has come up before and the answer is yes.
My second question is if you can use two copies of Song of Earendil on the same trigger. Say it's a two player game and at the end of the turn each player raises his threat by 1. If you have two copies, could you use Song of Earendil twice such that the other player has a net reduction of 1 threat and you have a net gain of 3 threat? If so, that could be an interesting meta with a Merry deck that passively reduces other players' threat. With 3x Hobbit Pipe, Good Meal, Galadhrim's Greeting, Elrond's Council, Smoke Rings, Dwarven Tomb/Map of Earnil I could see that deck dropping 5 threat every turn.