Ledger’s Joker randomly gets wind of a guy named Voldemort that it would be funny to kill. He gets all the information an informed Wizard from Harry potterverse might via capturing a Ministry of Magic worker and making him talk. He has a year to prep before the events of the beginning of Book 4 start.
Can prep and craziness overcome magic in just the amount of time required to get a win? He can use whatever means necessary in the time of prep, what happens during this interval, or afterwards?