War of Kings is amazing. Not only is the writing top-notch, but Paul Pelletier’s art is always exquisite. Couple that with Gladiator having such a central role and I reread it quite often.Also, the War of Kings omnibus is real good, too.
I remember the cover art for those books. Then the mists were killing off mutants later. But don't worry because "Quicksilver and Scarlet Witch were never mutants to begin with!"There was also a DeciMation tie in that featured Quicksilver, I think it was called Son of M, and it dealt with him sort of taking refuge with the Inhumans in the fall out of Avengers Disassembled and House of M, where he tried to regain his lost mutant powers by Terrigen mist exposure. The Inhumans have a significant role in that, especially Crystal and Luna.