Holocaust
Holocaust (Nemesis; X-Men, typically from Earth-295) appears in 12 issues in grailworth's catalog, and was first published in 1994.
Every appearance we value
Avengers (1963) 1 issue
Stryfe's Strike File (1993) 1 issue
X-Man (1995) 2 issues
X-Men (1963) 2 issues
X-Men (1991) 3 issues
X-Men Chronicles (1995) 1 issue
Character appearances from the Grand Comics Database, CC BY-SA 4.0.