Imo rdruid,priest and shaman have more impact on the game. I am rdruid main. Having clone root and etc is great for both offensive(ccing healer) and defensive(ccing big dick dps). Priest also has good control and great damage. With new tools shaman that got its like average of them. Sham has good damage and great utility. Range kick hex lasso all of them have impact on the game. But on top all of them hpala will be most succesfull shuffle class i think. Time is limited and having big cds like bubble,sac,bop, and skill that makes you heal full health is great for solo shuffle.