if i control robb stark and there is Grey Wind(attachment) with him,will my opponent put Grey Wind(attachment) to him?

if answer is yes,then what will happen when robb stark with two attachments named Grey Wind?

Nothing in the rules prevents there from being two unique cards with the same name in play at the same time - provided that they are not controlled by the same player.

Similarly, there is nothing in there rules that prevents a character from having two copies of a unique attachment on it at the same time - provided that they two copies are controlled by different players.

If you play your copy of Grey Wind on your copy of Robb Stark, there is nothing preventing your opponent from playing his copy of Grey Wind on your copy of Robb Stark, too. You can use your copy of the attachment, and he can use his copy of the attachment.

ktom said:

Cool, hadn't thought about that. This may actually be viable in two-on-two play.