Cheapest priced copy (Shadowmoor): $0.49 at Card Kingdom, near mint, their price list as of .
Impromptu Raid 
Enchantment · Rare · Shadowmoor · #209
{2}{R/G}: Reveal the top card of your library. If it isn't a creature card, put it into your graveyard. Otherwise, put that card onto the battlefield. That creature gains haste. Sacrifice it at the beginning of the next end step.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $0.49 to $2.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Shadowmoor | 209 | Rare | $0.49 | $2.99 |
2 rulings from Wizards of the Coast
- 1 May 2008If the ability is activated after the current turn’s End step has begun, the creature won’t be sacrificed until the next turn’s End step.
- 1 May 2008If you put a creature onto the battlefield and a different player takes control of it before the end of the turn, you can’t sacrifice it at end of turn. It will remain on the battlefield. It will have haste as long as it’s on the battlefield.