Yeah, though technically, I think you might be able to use Denethor more than 4 times (since taking the card into hand is the effect, not the cost). Of course, this could be considered stalling (similar to telepathy decks that used
Sam, FC without
Bill the Pony to shuffle their draw deck) and wouldn't have much use unless you're playing deck discard against someone who doesn't know what you're trying to do (most players would decline to draw after the first few cards) or are in a 3-player game and are trying to give one Shadow player the cards to attack the other Shadow player's leading fellowship.