Marvel Rivals doesn’t have too many long-tail ... However, the ultimate reward in each hero’s proficiency bar is the Lord icon. These are glossy icons that you and other players can see ...
Recently, Reddit user u/Mortal_shape shared a screenshot, highlighting that the Celestial rank icon draws inspiration from Eson the Searcher, a celestial created by Jack Kirby for Marvel.
You can only get a Lord icon in Marvel Rivals by completing hero proficiency tasks for each individual hero. This takes a decent amount of time, depending on how often you play the same hero.