an issue between Aragorn, Thorongil (15R55), Their Marching Companies (8U107), Shadowfax, Greatest of the Mearas (17R24), the Aragorn and shadowfax may trigger their effects of adding a threat to Remove a non existant burden or to not exert a minion weaker then aragorn even in the case of him having 0 strength so IB decks add threats all day even if you remove them, but the same case can't be said for their marching companies We cannot remove a threat to choose not to play a minion from our sites the game makes the decision for us
I'm not sure, if you are saying there is a problem with any of those cards, or not. I believe these cards work correctly, if you think otherwise, please be more specific, which card works incorrectly, what happened, and what you were expect to happen.
I assume you refer to not being able to activate
Their Marching Companies to remove a threat without card stacked on it in Shadow phase, or not being able to play the stacked minion. If so, you will find the answer to this problem below.
Here is a quote from Comprehensive Rules:
"If you perform an action that has playing a card from hand or discard pile as part of its effect, you must (be able to) play that card. This exception applies to all kinds of actions and all the different ways you can play a card (except playing a card directly from your draw deck)."
The rules are written in a very weird way - first they list, when the rule applies (playing from hand or discard) and then they say it applies to playing cards from all places but draw deck. So I go with the second part, as having better merit.
So, in case of
Their Marching Companies, you have to be able to play a stacked card (have twilight, meet all requirements), to be able to activate the ability. Therefore, if you have no stacked minions or are unable to play any of the stacked minions, you may not activate it (remove a threat).