Cheapest priced copy (The List): $0.35 at Card Kingdom, near mint, their price list as of .
Serrated Biskelion 
Artifact Creature — Construct · 2/2 · Uncommon · Duel Decks: Elspeth vs. Tezzeret · #46
{T}: Put a -1/-1 counter on this creature and a -1/-1 counter on target creature.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
3 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duel Decks: Elspeth vs. Tezzeret | 46 | Uncommon | $0.49 | — |
| The List | WTH-156 | Uncommon | $0.35 | — |
| Weatherlight | 156 | Uncommon | $0.35 | — |
One ruling from Wizards of the Coast
- 1 April 2008If Serrated Biskelion leaves the battlefield before its ability resolves, you’ll still put a -1/-1 counter on the targeted creature. If the target leaves the battlefield or otherwise becomes an illegal target before the ability resolves, the ability doesn’t resolve and you won’t put a -1/-1 counter on Serrated Biskelion.