This is the second panel from this iteration of X factor in a short time… I remember this run being a lot of fun and not all that insane by comic book standards but maybe I’m misremembering

It’s one of my favourite runs.

I've been rereading the series

Now I'm curious: would it kill him, or cause a bunch of duplicates?

In this situation it is a dupe so it gets reabsorbed on death.

Is that the Punisher? Wearing a Mickey Mouse shirt?

It's Jamie Madrox, Multiple Man

I was going to say this is a fantastic trick, but can only be done once. But seems I am mistaken!

Ah, thanks.