Cheapest priced copy (Teenage Mutant Ninja Turtles Eternal): $0.49 at Card Kingdom, near mint, their price list as of .
Exploding Barrel 
Artifact · Rare · Teenage Mutant Ninja Turtles Eternal · #39
{T}: Add one mana of any color. Put a pressure counter on this artifact.
{8}, {T}, Sacrifice this artifact: It deals 20 damage to target creature. This ability costs {1} less to activate for each pressure counter on this artifact. Activate only as a sorcery.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $0.49 to $4.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Teenage Mutant Ninja Turtles Eternal | 39 | Rare | $0.49 | $4.49 |