If we are going to pick 1 idea for a team attack, I would like a Chaitzu+Tien one.
Which if Chaitzu dies (maybe after using the ultimate), Tien uses his remaining life-force to kill the character on which it failed upon. Pretty much in the same manner as the Fusion Spirit Bomb. If it hits, it's an instant kill, if it misses, it's not but in both situations, Tien will die as well. But it needs to be insanely homing and really though to defend against, pretty much you then get that feeling of: "ow boy, I'm f*cked".