Cheapest priced copy (Scars of Mirrodin): $0.39 at Card Kingdom, near mint, their price list as of .
Contagious Nim 
Creature — Phyrexian Zombie · 2/2 · Common · Scars of Mirrodin · #58
Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.39 to $2.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Scars of Mirrodin | 58 | Common | $0.39 | $2.99Out of stock |
6 rulings from Wizards of the Coast
- 1 January 2011Damage from a source with infect affects planeswalkers normally.
- 1 January 2011If damage from a source with infect that would be dealt to a player is prevented, that player doesn’t get poison counters. If damage from a source with infect that would be dealt to a creature is prevented, that creature doesn’t get -1/-1 counters.
- 1 January 2011Infect’s effect applies to any damage, not just combat damage.
- 1 January 2011Damage from a source with infect is damage in all respects. If the source with infect also has lifelink, damage dealt by that source also causes its controller to gain that much life. Damage from a source with infect can be prevented or redirected. Abilities that trigger on damage being dealt will trigger if a source with infect deals damage, if appropriate.
- 1 January 2011The -1/-1 counters remain on the creature indefinitely. They’re not removed if the creature regenerates or the turn ends.
- 1 January 2011A player who has ten or more poison counters loses the game. This is a state-based action.