Cheapest priced copy (Edge of Eternities): $0.35 at Card Kingdom, near mint, their price list as of .
Nanoform Sentinel 
Artifact Creature — Robot · 3/2 · Common · Edge of Eternities · #71
Whenever this creature becomes tapped, untap another target permanent. This ability triggers only once each turn.
Legal inCommanderBrawlStandardPioneerModernLegacyVintagePauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Edge of Eternities | 71 | Common | $0.35 | $0.49 |