Cheapest priced copy (Mirrodin Besieged): $0.35 at Card Kingdom, near mint, their price list as of .
Serum Raker 
Creature — Phyrexian Drake · 3/2 · Common · Mirrodin Besieged · #31
Flying
When this creature dies, each player discards a card.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Mirrodin Besieged | 31 | Common | $0.35 | $0.49 |