Coliseum

The Colosseum, in Yu-Gi-Oh! BAM, is a new feature added to the game on its first anniversary on Kongregate, April 18, 2014.

This allows the player to battle a random player in a Booster Battle, a new type of duel. Whoever wins gets a random card from the Series 2 Live Series pack. The one who loses doesn't get anything. It costs 2.