Most accurate TIER list [2.6.2]
Wraith, Clown, Pig, Plague (maybe D Tier, hard to tell with her movementspeed nerf)
I don't know where to place Hag, I don't play her much cuz her playstyle is boring for me. From what I see and hear I would put her B tier.
Same with Legion, I don't play him much cuz braindead. Probably around C - D tier.