I don't want to encourage anyone since I am not fond of this idea at all, but I think one exertion for removing a threat is too easy of a cost to achieve. Most decks have ample healing in the form of sanctuaries and other cards. As the game stands, there are not too many cards (in Movie Block) that remove threats--the major exception being when a character dies.
I would rather see adding a burden to remove a threat personally since it is a larger cost. Or maybe putting on the One Ring to remove a threat.
-wtk