Magic is always the cover all explanation, which is why some people love it and some people hate it, and why some writers handle it well and others poorly. You can come up with any hokum to resurrect someone with it, whether a ninja ritual or a bunch of flags coming together.
To be fair, the idea of venturing into the underworld to bring back someone who had died is about as old as the Greek myths themselves, and maybe older, least in stories. The downside if there is never any suspense about any consequence lasting, it can shatter that suspension of belief. If "anything is plausible", then nothing is. Just like if everyone is special, no one is.
The last time we saw the original Vision, it was during MIGHTY AVENGERS when Absorbing Man was effecting reality and had him split off from Jonas. In NOVA, the fact that Namorita existed in an area outside of normal space & time's laws was enough of a reason for Nova to bring her back. It seems the CHAOS KING is effecting reality, which is also a "get out of death free" card. At least it works better than Hand ninja rituals or Skrull abductions. Reality warping tends to do the trick almost more than sheer magic, even if it sometimes is related to magic. "Gods change stuff sometimes," isn't that JMS' whole justification of his WONDER WOMAN run?
FYI, Alpha Flight is reuniting; CHAOS WAR brings back the dead founders.
Marvel sure has been resurrection happy, although I will be curious if even Mar-Vell comes back. He's the superhero Uncle Ben, his best feat was dying. It also would continue to make that BOOK OF THE DEAD 2005 handbook worthless, as nearly everyone in it is no longer dead.
