oddsmaker [odz-meyk-er]
noun
1. A person who calculates or predicts the outcome of a contest, as in sports or politics, and sets betting odds.
EX. Who wants to be the oddsmaker on this? I'd put all my Pokédollars on #2, because it is the most interesting. Pokémon forms are lame, in my humblest of opinions, but I guess some people like that sort of thing: