Cheapest priced copy (Theros): $1.29 at Card Kingdom, near mint, their price list as of .
Prowler's Helm 
Artifact — Equipment · Uncommon · Theros · #219
Equipped creature can't be blocked except by Walls.
Equip {2}
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $1.29 to $4.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Theros | 219 | Uncommon | $1.29 | $4.49 |