This deck is a lot of fun. Easy to play, but also easy to counter at times.
your ideal location is Iron Man/Onslaught/Mystique (copying Onslaught)/Omega Red. This is surprisingly difficult to do because you need a T7 and you can’t waste your own T5 playing Magik to make it happen because you’re playing an Iron Man that turn.
So since you need location/opponent cooperation for that, it’s simpler and more logical to use Cosmo/Omega Red/Iron Man/Onslaught. Much harder to disrupt without something like Aero or Magneto (who ruins this deck handily when relying on Omega Red). Klaw has less trouble with Magneto.
As much as I like Warpath, it also telegraphs Galactus decks right to their 4 cubes so I had to cut him (at least until Galactus is less meta).