Morphing into animal via Aggressor bar (not the power bar) and then being able to execute whole new set of moves or finishers if the opponent has small amount of health and it's your second round to win.

If you chose you won't morph and just get the original shadow from MKT and get different kind of bonuses for each fighter like increased movement speed, attack speed, high chance to double damage, stone skin (put whatever you like here).

That way I will enjoy animalities for real plus I always wanted for aggressor mode to return in some way.