There is 3 tactics against a phoenix team that I have found to be very useful during the matches that I have been playing:
1: Snapback - When you want to be an advanced player at some point, you are going to have to learn viable combo’s, where you can easily snapback your opponent without inflicting the damage of the combo by a lot. This is not only useful for Phoenix’s but also damaged assists with a big red bar to make sure he won’t regenerate at any point during the game.
This won’t always work, because even if you learn to snapback properly, a good Phoenix can block your post-snapback setups and just kite you and create save swap outs with another character.
2: Keep away - Even though this is very situational ; Keep phoenix at about 5-10% HP, and let the timer run out, do not let her transform into Dark Phoenix. Try to snap her out and kill the other characters if shes the last one. Of course this is a risky choice, and very punishable if she catches you with a xfc lvl 3 combo, but without being Dark Phoenix, it is very possible to keep her away and having a good eye on the timer/health bar.
3: Aerial Rave - Not a lot of Phoenix players expect this, so you have to work on the setups. Once you have Phoenix with a level 5 Gauge in a combo, make sure you snap your character out the moment she will hit Dark Phoenix, your character flying in can catch her without getting hit stunned by the aura. It’s tricky to time but if done correctly you can continue destroying her with her little HP.
Hope I helped, just keep playing and practicing. It’s always going to be very hard killing a spamming XFC LVL 3 Dark Phoenix, if not impossible. Only thing you can do is anticipate it.
Oh btw, Sentinel’s Hard Drive makes him immune for projectiles so it will just ignore Phoenix’s DP. Prolly some other hyper’s that do that tho, no clue.
x-23, captn both have one aswell, dunno how usefull those are against phoenix