Cheapest priced copy (Revised Edition): $0.35 at Card Kingdom, near mint, their price list as of .
Nettling Imp 
Creature — Imp · 1/1 · Uncommon · Intl. Collectors' Edition · #118
{T}: Choose target non-Wall creature the active player has controlled continuously since the beginning of the turn. That creature attacks this turn if able. Destroy it at the beginning of the next end step if it didn't attack this turn. Activate only during an opponent's turn, before attackers are declared.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
10 printings · $0.35 to $109.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Unlimited Edition | 118 | Uncommon | $2.49 | — |
| 30th Anniversary Edition | 114 | Uncommon | $1.29 | — |
| 30th Anniversary Edition | 411 | Uncommon | $99.99 | — |
| Revised Edition | 119 | Uncommon | $0.35 | — |
| Collectors' Edition | 118 | Uncommon | $1.99 | — |
| Intl. Collectors' Edition | 118 | Uncommon | $2.49 | — |
| Foreign Black Border | 119 | Uncommon | — | — |
| Limited Edition Alpha | 117 | Uncommon | $109.99Out of stock | — |
| Limited Edition Beta | 118 | Uncommon | $27.99 | — |
| Summer Magic / Edgar | 119 | Uncommon | — | — |
4 rulings from Wizards of the Coast
- 4 October 2004The creature is destroyed if it does not attack because it simply can’t do so legally.
- 4 October 2004You can use this effect on a creature you know won’t be able to attack. For example, you can use it on a tapped creature.
- 4 October 2004If the Imp leaves the battlefield before the end of the turn, the creature still is destroyed.
- 20 September 2013If a turn has multiple combat phases, the ability can only be activated before the beginning of the declare attackers step of the first combat phase in that turn.