Cheapest priced copy (The List): $0.59 at Card Kingdom, near mint, their price list as of .
Signal Pest 
Artifact Creature — Pest · 0/1 · Uncommon · Mirrodin Besieged · #131
Battle cry (Whenever this creature attacks, each other attacking creature gets +1/+0 until end of turn.)
This creature can't be blocked except by creatures with flying or reach.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
3 printings · $0.59 to $8.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| DCI Promos | 66 | Rare | — | $8.99 |
| Mirrodin Besieged | 131 | Uncommon | $0.69 | $7.99 |
| The List | MBS-131 | Uncommon | $0.59 | — |