Imho this game is a bit too tame.
When you off a character you get reset to neutral, when you run out of time you lose characters and your composition, so fine, i get it, you are punished for having an advantage, just so it will take more time to walk over someone, so it was made to be tame by design, and I see how Dark Phoenix doesn't fit, but devs please can we have some fun?
It fits lore wise and just look at her! I'm 100% sure they discussed this and decided they won't do it, but cmon, I only get ragequitted on 50% of the time, I want this to be 90%.
Edit: for those who don't know, in MVC3 if Phoneix died with 5 super bars she turned into Dark Phoneix and was by far the best character in the game, combined with her being the last character the games XFactor this was a win condition, and you could just teamkill with her as long as your opponent is not prepared. If you fail to win however you die, because she is on a timer very much like characters in Sudden Death now.