Cheapest priced copy (Dominaria United): $0.59 at Card Kingdom, near mint, their price list as of .
Shield-Wall Sentinel 
Artifact Creature — Golem · 1/3 · Common · Dominaria United · #238
Defender
When this creature enters, you may search your library for a creature card with defender, reveal it, put it into your hand, then shuffle.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.59 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Dominaria United | 238 | Common | $0.59 | $0.79 |