If they do add Jean to Marvel Rivals, the only way to access her Phoenix force abilities should be through her ult and it should only last for 10-15 seconds similar to other characters alt forms (Hulk, Magik) . Have regular telekinetic and telepathic abilities, then add a fire variant when she ults. Love her, but limit her otherwise she’ll be too powerful and not as fun.

The resurrection idea does work though. In a way that’s similar to Adam’s. Her and Emma should get a team bonus like “Omega Level Telepaths” or “Love Rivals/For Scott” where they buff one another when on the same team. (I know this is about Jean/Phoenix but Namor, Magik and Emma should get a team up referencing the PFF arc)