Treasures are a specific type of token. When using Treasures, you tap one, sacrifice it, and add one mana of the color you choose to your mana pool. Treasures skip the stack, so there's no way to counter them.
A curmudgeon of a cattle rustler fits right in to the Frontier Fantasy aesthetic of Thunder Junction, so Bruse Tarl is right at home in a cowboy hat and spurs!