Who should be the Bad Guy(s)?

Well, personally I would love to see the Enchantress along with the Executioner, This is because you can get a good mix between the physical brawling everyone loves, and also do some potential character developement for Sif or Jane. Furthermore Loki could also be helpful here, if he manages to escape, and returns to Thanos, and gives direction to The Enchantress from outer space.

Let me know what you think.