I'd say it's Rob Liefeld except that I see a foot.

I had this whole run as a kid! Sam Keith drew the best Wolverine and the best Nightcrawler ever!

All of the anatomy oddities look like they are on purpose though.

They'd have to be, but why? Is it critique? Parody? Celebration? I personally find these exaggerated styles ugly and distracting. The impossible anatomy and messed up angles just distracts from the visual harmony of a well constructed panel.

Stylization. The exaggerated muscle look was very popular in 90s comics. So popular that a number of Marvel's illustrators (including Liefeld) were able to break off and make their own successful company.

I remember when it came in. I didn't get/like it then either.