Cheapest priced copy (Mirage): $0.49 at Card Kingdom, near mint, their price list as of .
Amber Prison 
Artifact · Rare · Mirage · #292
You may choose not to untap this artifact during your untap step.
{4}, {T}: Tap target artifact, creature, or land. That permanent doesn't untap during its controller's untap step for as long as this artifact remains tapped.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
3 printings · $0.49 to $0.69 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Classic Sixth Edition | 272 | Rare | $0.69 | — |
| Mirage | 292 | Rare | $0.49 | — |
| The List | MIR-292 | Rare | $0.49 | — |