Cheapest priced copy (Ixalan): $0.49 at Card Kingdom, near mint, their price list as of .
Wily Goblin 
Creature — Goblin Pirate · 1/1 · Uncommon · Ixalan · #174
When this creature enters, create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.")
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.49 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Ixalan | 174 | Uncommon | $0.49 | $0.99 |