Cheapest priced copy (Mirrodin Besieged): $3.99 at Card Kingdom, near mint, their price list as of .
Plague Myr 
Artifact Creature — Phyrexian Myr · 1/1 · Uncommon · Mirrodin Besieged · #125
Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)
{T}: Add {C}.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
3 printings · $3.99 to $8.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| DCI Promos | 65 | Rare | — | $8.99 |
| Mirrodin Besieged | 125 | Uncommon | $3.99 | $8.99 |
| Phyrexia: All Will Be One Commander | 139 | Uncommon | $4.49 | — |