Any Phase: Bring Jaqen H'ghar out of Shadows by paying the rest of his cost to choose 1 non-Army character in an opponent's dead pile that was killed this phase, and attach it to Jaqen H'ghar as a duplicate. Jaqen H'ghar gains the printed text, base STR, icons, traits and crests of that card. If that duplicate leaves play, return Jaqen H'ghar to Shadows.
Let's say that because of claim 2, two characters are in opponent's dead pile. I come out of Shadows with Jaqen and then I come out of Shadows with second copy of Jaqen. I'm not sure what happens now.
