Killosseum

From BoardGameGeek:

The most deadly and popular arena, Killosseum, draws in a huge daily crowd where people come to watch gladiators battle for their lives. A lot of people also make a living betting on these fights to the death and it is a spectacle for all to enjoy. In the game of Killosseum, you will be playing as a Lanista. As the Lanista you will make bets on matches and have your own gladiator fight in your honor. Your goal is to make as much money as possible and be the first person to gain enough coin to be crowned the most affluent Lanista of the arena. -description from the designer