Though Jean Grey and the Phoenix Force have long been separated, their bond is unique. More than a mere host, Jean is a part of the Phoenix, as the Phoenix is a part of her. When Jean was brought to the Battlerealm and exposed to ISO-8, the highly mutagenic properties of ISO-8 reopened Jean's latent connection the universal force of life, and the Phoenix was reborn again, this time into the Contest of Champions!
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Passive: The Phoenix's connection to the cosmic Phoenix Force entity is the source of much of her power. She begins the fight with 1 Phoenix Force charge, and periodically generates Fury Buffs based on her current number of Phoenix Force charges.
Passive: Once per fight when the Phoenix would be knocked out, she immediately becomes invulnerable for 2 seconds, and consumes all of her Phoenix Force charges, regaining X%health per charge. After which she gains 1 Phoenix Force charges.
Before gaining his Signature Ability, Edict, Ronan's ability to convert Fury to Weakness helps him a little against Phoenix. However, once his Edict ability kicks in, Phoenix will have to be very careful as she will almost always have many stacks of Fury to trigger the full damage and Stun duration bonus.
Few Champions have the ability to interfere with Phoenix's core Fury building loop like Doctor Strange. Nullify, Counterspell, and Fate Seal all have the ability to throw Phoenix's timing out, leaving her struggling to do damage!
Enhanced Fury: The Phoenix Force passive ability allows the Phoenix to create lots of Fury buffs. Increasing the effect of each of these can have a large impact on her damage potential.
Courage: Similar to Enhanced Fury, increasing Phoenix's attack translates to a large damage increase, and her Signature Ability makes playing around at low Health values a little less dangerous.
Inequity: When playing for sustained damaged, the Phoenix can keep herself in the Empowered zone for quite a while, gaining a guaranteed Incinerate on hit. These stack up fast, and can make a difference for the Phoenix who lacks powerful defensive tools beyond her Signature Ability.