You're thinking of Colossus.
Colossus walked all over Thor and Iron Man.
Juggernaut off paneled Colossus(he may not have even been armored up because he was normal, and he stays in whatever form he's ko'd in).
And he fought Gambit because he was jealous of him and Rogue. Then he got the Cytorrak gem and became stronger.
And after all that he gets shot in the eye by a null dart and dies.