yeah, I think there might be some call for that. Harbinger #1 isn't a major key, but it's much more of a key than New Mutants #98.
Seriously? In some circles, NM 98 is THE key book of the copper age. That, and TMNT.
I know if you are a fan of Deadpool, things may appear this way. But in general, New Mutants 98 is not THE key book of the Copper Age. There are many other books which may rank higher as critical, depending on your collecting focus.
Especially Adventurers 1 Skeleton Variant.
groin punch. Deadpool is the best thing marvel has ever come up with.
1980s thinking: Cable - greatest thing to come out of Marvel
1990s thinking: Venom - greatest thing to come out of Marvel
20X0s thinking: New Mutants 98 is worth a whole bunch - I found my new hero
There was no Cable in the '80s.
Technically, Cable first appeared in Uncanny X-Men 201 as Baby Nathan / Baby Cable, which was in the 1980s.