You are a wealthy new villain who wants to wipe out the justice league. You get as much prep you need and you have 1 trillion dollars. No body is gonna stop you in you prep because nobody knows your evil. So there is a assembly in the city with around 1000 armed guards along with police dogs and 1000 + people. You must take out Superman, Batman, Wonder Woman, Cyborg, Martian Manhunter, and Halkman. They are on a stage giving a speech. No bombing the city are causing mass damage. You also have to get away with your life. You can't call on help from real villains.