Magus
Magus (evil future version of Warlock, typically from Earth-7528) appears in 7 issues in grailworth's catalog, and was first published in 1974.
Every appearance we value
Avengers (1963) 1 issue
Avengers Forever (1998) 1 issue
Quasar (1989) 1 issue
Rune (1995) 1 issue
Strange Tales (1973) 3 issues
Character appearances from the Grand Comics Database, CC BY-SA 4.0.