Cheapest priced copy (Jumpstart 2022): $0.39 at Card Kingdom, near mint, their price list as of .
Goldhound 
Artifact Creature — Treasure Dog · 1/1 · Common · Streets of New Capenna · #108
First strike
Menace (This creature can't be blocked except by two or more creatures.)
{T}, Sacrifice this creature: Add one mana of any color.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.39 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Jumpstart 2022 | 549 | Common | $0.39 | — |
| Streets of New Capenna | 108 | Common | $0.49 | $0.99 |
3 rulings from Wizards of the Coast
- 29 April 2022Since Goldhound is a creature, its {T} ability can't be activated the turn that it enters the battlefield or the turn a player gains control of it unless it has haste.
- 29 April 2022If an effect refers to a Treasure, it means any Treasure artifact, not just a Treasure artifact token.
- 29 April 2022Even when it is on a creature, Treasure is an artifact type and not a creature type. Similarly, Dog is always a creature type and not an artifact type.