X-Factor #108 (1994) (High Grade)

Until recently, Mystique was presumed dead. But Forge has picked up the shapeshifter's trail and along with his teammates, he follows it to Israel to uncover the truth.

The higher ups don't believe that Mystique is dead. Their fears are warranted after a bit of sleuthing. Mystique is in Israel to finally get her revenge on Legion for the death of Destiny. X-Factor interferes, but they aren't the ones to stop her. Legion is back and he's been waiting for Mystique.