5 star rank up
I have just received a x-23 five star. What rank should I take her to? She is my second best five star behind magik. My others are ironman(sup), red skull, venom pool, and Karnak. Not a whole lot to do there. Magic is R3 but should I wait until x23 is awakened to take her to R3 and focus on my better four stars to R5. Is red skull even worth R3?