Live Poll: Nasty Targaryens

They say every time a Targaryen is born, the Gods flip a coin: one side is greatness, the other is madness. Which of these villainous characters of House Targaryen seen in the "World of Westeros" TV series is the nastiest? 

List: https://www.imdb.com/list/ls4157528717

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Poll: https://www.imdb.com/poll/Z7LHsWzHu6gEnuIfpUVN3A/