Cheapest priced copy (Mercadian Masques): $0.35 at Card Kingdom, near mint, their price list as of .
Crenellated Wall 
Artifact Creature — Wall · 0/4 · Uncommon · The List · #MMQ-290
Defender (This creature can't attack.)
{T}: Target creature gets +0/+4 until end of turn.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.35 to $5.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Mercadian Masques | 290 | Uncommon | $0.35 | $5.99 |
| The List | MMQ-290 | Uncommon | $0.35 | — |