Cheapest priced copy (Mirrodin Besieged): $0.49 at Card Kingdom, near mint, their price list as of .
Flensermite 
Creature — Phyrexian Gremlin · 1/1 · Common · Mirrodin Besieged · #41
Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)
Lifelink (Damage dealt by this creature also causes you to gain that much life.)
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.49 to $3.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Mirrodin Besieged | 41 | Common | $0.49 | $3.99 |