Cheapest priced copy (Shadowmoor): $0.35 at Card Kingdom, near mint, their price list as of .
Sinking Feeling 
Enchantment — Aura · Common · Shadowmoor · #51
Enchant creature
Enchanted creature doesn't untap during its controller's untap step.
Enchanted creature has "{1}, Put a -1/-1 counter on this creature: Untap this creature."
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Shadowmoor | 51 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 1 May 2008Sinking Feeling grants the untap ability to the creature it’s enchanting. Only the creature’s controller can activate that ability, not Sinking Feeling’s controller.