Dockside Extortionist enters the battlefield, it triggers, creating at least four Treasure tokens.
Activate three Treasure tokens by tapping and sacrificing them, adding ({R} magic symbol) ({R} magic symbol) ({R} magic symbol) that can only be spent as though it were colorless mana due to
Celestial Dawn.
Repeat.
Once you have infinite Treasure tokens, you may tap and sacrifice them to get infinite ({W} magic symbol) that can be spent as any color, or infinite mana of any other color that can only be spent as though it were colorless mana.