Which Mystic to Rank Up to 4* 5-50 or 5* 3-45??

DuMonU

Have Deep Wounds at 5 and Mystic Dispersion at 4. Love Guilly's Bleed, Magik's Power Control, Mordo's defense in AW and Hood's usefulness

MEKA5

They're all good options. So really depends on what your needs are ;-)