I asked the dude who posted this on twitter where this came from but he never responded so unfortunately I can't tell you if this is some sort of fan art or if it came out any publication.
So today I bought a brand new Marvel comic for first time in almost years. Marvel's treatment of the ROM spaceknight legacy has prompted me toward a personal boycott of new comics to say nothing of the cover prices these days. But I finally made an exception for this one shot issue of Magneto & The Mutant Force which has Sabra among the cast of characters. I'd say it's been around 3 years since she last made an appearance in any Marvel title so I had to check this out.In this alternate reality there are no Avengers and Sabra is part of a mutant rebellion led by a paraplegic Magneto against the government which Squadron Supreme are agents of. It would have been nice had there been a bit more of her in the issue but over all I thought it was ok. Been out of the loop for quite a while when it comes to all things going on in the published Marvel Universe so I'm sure there's some context to the story I'm missing here.