COVER BY: DAVID FINCH WRITER: MIKE CAREY PENCILS: JOHN ROMITA JR. COLORED BY: FRANK D'ARMATA THE STORY: "LEGACY" The X-Men's past becomes the present as Xavier fights the greatest battle of his life. With his mind hanging in the balance, one false move can cause irreversible damage. Help arrives from an unlikely source, but in the world post-Messiah Complex, sometimes your enemies are the only people you can trust. Rated A…$2.99 IN STORES: February 27, 2008