When using Master of the Forge's ability, if at least one of the top five cards on my deck is an attachment, do I have to choose one and add it to my hand, or can I reshuffle it with the other four cards?
(Reason for wanting to do this: say I need to try to dig a copy of Vilya out of the deck, I have MotF in play but no Imladris Stargazer to peek at those top five cards. On searching the top 5 cards the only attachment is one I can only play using Vilya, so I don't want to add it to my hand.)