That system can be applied for any RNG-based content in the game, with yhe number of tokens needed depending on the difficulty, with many possibilities. Like, for example: - 1 token drops per champion, a chest requires 1 token to pull a random reward. Every consecutive pull gives better loot. Final possible token at highest difficulty gives a guaranteed exotic, while others prior to it only increase the chance. - certain number of tokens per completion, bronze would give 1, silver 3, gold 5, platinum 8, and the chest in legend costs 10 to open. Higher difficulty chests have reduced cost. (Numbers subject to discussion.) - Completion only gives tokens (higher diff. gives more, platinum gives the most), and Zavala is a vendor that sells exotics in exchange for certain amount of tokens. There can be more options, these are just my suggestion.