Does this count as a crossover? I have no idea. I do know it's directly inspired by the cover.
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Contains "Avengers" spoilers, by the way.
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Welcome to Equestria, a land protected by ponies with extraordinary powers. Roll-Call! There's Captain Applemerica, a long-frozen captain from Equestria War II. The Incredible Spike, a young dragon with breath-taking anger-management issues. Iron Mare, a genius, billionaire, play-mare, Pinkanthrapist. Purple Widow, a super-spy with a thing for fashion. War Mach-Shy, a shy mare behind a justice-bringing, trigger-happy suit built by a friend. Rainbow "Thor" Dash, a goddess of thunder and lighting. And last, but certainly not least, the leader of B.O.O.K.S.(Best Of Our Key Saviors), Twilight "Fury" Sparkle.

EDIT: Yes, for now the story is officially cancelled. It is not likely this will change, so don't hold your breath for a new chapter.