Medusa Corvus and Hyperions sig ability is more useful for defence while I can utilise Phoenix any time. I mean they are all useful in offence. I’m not sure if I will open good champs any time soon.
Wait for Hyperion or medusa. Phoenix heal is low & not that useful.
i suppose its worth mentioning she's #3 in prestige. Maybe another consideration.
Keep the Gem, the cosmic pool if filled with greater Champions....Hyperion, Medusa, Venom... and many othersBut hey, If you like Phoenix, go for it.