Cheapest priced copy (Mirrodin Besieged): $0.99 at Card Kingdom, near mint, out of stock, their price list as of .
Corrupted Conscience 
Enchantment — Aura · Uncommon · Mirrodin Besieged · #22
Enchant creature
You control enchanted creature.
Enchanted creature has infect. (It deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.99 to $5.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Mirrodin Besieged | 22 | Uncommon | $0.99Out of stock | $5.99 |
| The List | MBS-22 | Uncommon | $1.49 | — |
One ruling from Wizards of the Coast
- 1 June 2011Multiple instances of infect on the same creature are redundant.