Wow! I have never seen anything like that in 30 years of building PCs. Without the photo evidence I wouldn't have thought it even possible! Hate to say it, but that card is fully fried. IMO there is no way you (or anyone else) will get that working. The parts are surface mounted, so everything in the scorch radius at a minimum (assuming no electric surge damage to peripheral components, which is imo highly unlikely) would need replacing, and hand desoldering/soldering that many surface mount parts, which requires highly expensive specialized equipment and experience, would definitely cost more than the card - and that would be assuming the PCBs aren't damaged which they clearly are (the PCB is multi layer, so there are probably 8 or more stacked PCBs, only two of which are visible).