The Avengers of 1,000,000 BC by Esad Ribic (soon after their first appearance in 2017's Marvel Legacy #1). Used as a variant cover for 2018's Avengers Vol.1 #677 (an issue of the No Surrender story arc).
reading fanfiction will always lead to you loving a character who isn’t even in the fandom your reading in they’re literally an oc made by a fanfic writer so you know that the fic is probably the only time you’ll ever see them so you dread when it finally ends