Cheapest priced copy (Jumpstart): $0.35 at Card Kingdom, near mint, their price list as of .
Parasitic Implant 
Enchantment — Aura · Common · New Phyrexia · #67
Enchant creature
At the beginning of your upkeep, enchanted creature's controller sacrifices it and you create a 1/1 colorless Phyrexian Myr artifact creature token.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Jumpstart | 262 | Common | $0.35 | — |
| New Phyrexia | 67 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 1 June 2011The controller of Parasitic Implant will control the Myr token no matter who controlled and sacrificed the enchanted creature.