Cheapest priced copy (Fifth Dawn): $0.35 at Card Kingdom, near mint, their price list as of .
Spinal Parasite 
Artifact Creature — Insect · -1/-1 · Uncommon · Fifth Dawn · #155
Sunburst (This creature enters with a +1/+1 counter on it for each color of mana spent to cast it.)
Remove two +1/+1 counters from this creature: Remove a counter from target permanent.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Fifth Dawn | 155 | Uncommon | $0.35 | $0.49 |
3 rulings from Wizards of the Coast
- 1 December 2004Yes, this card’s base power/toughness is -1/-1. If it has five +1/+1 counters on it, it’s a 4/4 creature.
- 1 December 2004If Spinal Parasite is a 1/1 because it has two +1/+1 counters on it, you can remove both counters to pay for its activated ability.
- 1 December 2004Any permanent is a legal target for Spinal Parasite’s ability, not just one with a counter on it. The player who controls Spinal Parasite chooses which counter to remove from the targeted permanent.