We've only enjoyed the presence of Ancient Copper Dragon since its release with Commander Legends: Battle for Baldur's Gate, which dropped in 2022
For starters, there's a whole lot of potential in the card itself, even if you want to just opt for the equally as beautiful, if a little less expensive, Legendary variant (which is valued at just under $6 right now)
Many key Legacy lands are on the reserved list, for example, so a Legacy manabase can easily cost more than $2000.) Aware of this history, Wizards played it safe with MM1: conservative print runs, and an MSRP of $7 per pack, in the hopes of making a limited-release reprint set that wouldnt crater existing card prices
On top of that, this card can potentially pay for itself with its Treasure creation and even copies instants and sorceries you cast