Cheapest priced copy (Future Sight): $0.35 at Card Kingdom, near mint, their price list as of .
Deepcavern Imp 
Creature — Imp Rebel · 2/2 · Common · Future Sight · #83
Flying, haste
Echo—Discard a card. (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
3 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Future Sight | 83 | Common | $0.35 | $0.49 |
| Modern Masters | 79 | Common | $0.35 | $0.49 |
| Time Spiral Remastered | 110 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 1 May 2007If you have no cards in hand, you can't pay the echo cost and Deepcavern Imp will be sacrificed.