Avengers Annual #10 features the 1st appearances of Rogue and Madelyne Pryor.  It contains a host of other crossovers, too:  Spider-Woman, X-Men, Carol Danvers, and the Brotherhood of Evil Mutants.  Story by Chris Claremont and art by Michael Golden.  Awesome book!  It is graded 9.6 NM+ with white pages by CGC.