Fan Casting "Shouldn't We Have a League of our Own?" in The Justice League

At night, a motorboat is seen zooming towards a yacht. A masked figure gets off the boat and walks onto the yacht towards a man in a suit and says "You better not be wasting my time" to the man who is revealed to be Lex Luthor. Lex talks about the events of the movie and asks the masked person, who is Deathstroke, if he wants to join the team. Deathstroke accepts and shakes hands with Lex.