the ancient copper dragon just seems the most versatile in many decks having a similar outcome to casting dockside extortionist, people just love making tons of treasures. That being said, its not very interesting just good in any circumstance. The ancient brass can be as good as an insurrection in the right scenario and it deserves points for that, but i have to say copper is never bad.
Ancient Copper Dragon with the new Cavern Hoard Dragon could be an insane combo. Always a bit scary to cast an ancient dragon, because of counters haha
