Cheapest priced copy (Duel Decks: Elves vs. Goblins): $0.35 at Card Kingdom, near mint, their price list as of .
Skirk Drill Sergeant 
Creature — Goblin · 2/1 · Uncommon · Legions · #112
Whenever this creature or another Goblin dies, you may pay {2}{R}. If you do, reveal the top card of your library. If it's a Goblin permanent card, put it onto the battlefield. Otherwise, put it into your graveyard.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
3 printings · $0.35 to $1.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duel Decks: Elves vs. Goblins | 49 | Uncommon | $0.35 | — |
| Duel Decks Anthology: Elves vs. Goblins | 49 | Uncommon | $0.35 | — |
| Legions | 112 | Uncommon | $0.35 | $1.49 |