Cheapest priced copy (Tales of Middle-earth Commander): $22.99 at Card Kingdom, near mint, their price list as of .
Cavern-Hoard Dragon 
Creature — Dragon · 6/6 · Mythic · The Hobbit Eternal · #23
This spell costs {X} less to cast, where X is the greatest number of artifacts an opponent controls.
Flying, trample, haste
Whenever this creature deals combat damage to a player, you create a Treasure token for each artifact that player controls.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
5 printings · $22.99 to $84.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The Hobbit Eternal | 23 | Mythic | $29.99 | $39.99 |
| The Hobbit Eternal | 63 | Mythic | — | $84.99 |
| Tales of Middle-earth Commander | 31 | Rare | $22.99 | — |
| Tales of Middle-earth Commander | 114 | Rare | $34.99 | — |
| Tales of Middle-earth Commander | 433 | Rare | $39.99 | $74.99 |
4 rulings from Wizards of the Coast
- 16 June 2023If the greatest number of artifacts an opponent controls is seven or more, Cavern-Hoard Dragon costs {R}{R} to cast.
- 16 June 2023Cavern-Hoard Dragon's last ability cares about the number of artifacts that player controls as the ability resolves.
- 16 June 2023Once a player has announced that they are casting Cavern-Hoard Dragon, no player may take actions to try and change the greatest number of artifacts an opponent controls before Cavern-Hoard Dragon's cost is locked in.
- 16 June 2023Cavern-Hoard Dragon's first ability counts only the artifacts controlled by the opponent who controls the greatest number of artifacts among your opponents. If you have an opponent who controls two artifacts and another opponent who controls three artifacts, Cavern-Hoard Dragon's mana cost would be reduced by {3}.