Here's the original post as well as description provided. I'm just posting this to save it:
https://www.reddit.com/r/marvelsnapcomp/comments/1afkduw/deck_guide_for_the_best_phoenix_force_deck/
Summary if you're lazy:
Establishers - Nico, Torch, Multiple Man, Nimrod OR Venom
Enablers - Carnage, Venom, Deathlok
Support: Ghost Spider, Shuri, Phoenix
Finisher: Zola
Flex/Tech: Enchantress
Wincon: One of the Establishers with one of the enablers and Phoenix sets you up nicely. Shuri is okay but Phoenix is the star of the deck and works beautifully with Nico, Torch and MM.
Tips:
I think all of Nico's spells here have some merit, but the establisher line is specifically the one where she grows x2 after another card play. The idea is to play her, destroy, then Res with Pheonix. This will give you a 1-7 on revive, which will then trigger the On Reveal to become 1-14. Use Zola to get two 28 Power Nicos into 2 lanes. If you have Shuri, you can use Shuri, Phoenix, then move Nico to get 48 Power instead.
Nimrod can soft tech against Shang if you are worried about a telegraphed Shuri. It can also be used to guard a particularly large card once he is buffed since destroying Nimrod just creates 2 extra copies of him.
Subs/Flex choices:
Poster notes Tribunal is a semi-hard match up so he specifically runs Enchantress. IMO, in an unknown or neutral meta, Caiera is probably you're preferred slot as it guards Torch and Nico and stops Killmonger from facewrecking you.
Otherwise, Forge is a nice buff tool, doesn't mind being destroyed and being 1 cost is easy to slot in. Tasky is a separate finisher that can copy a huge Torch or Venom as alternatives if you don't draw your best Wincon.