Cheapest priced copy (New Phyrexia): $7.99 at Card Kingdom, near mint, their price list as of .
Hex Parasite 
Artifact Creature — Phyrexian Insect · 1/1 · Rare · New Phyrexia · #137
{X}{B/P}: Remove up to X counters from target permanent. For each counter removed this way, this creature gets +1/+0 until end of turn. ({B/P} can be paid with either {B} or 2 life.)
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $7.99 to $29.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| New Phyrexia | 137 | Rare | $7.99 | $29.99 |
2 rulings from Wizards of the Coast
- 1 June 2011You may choose a value for X that’s greater than the number of counters on the targeted permanent. However, Hex Parasite only gets the bonus for counters actually removed.
- 1 June 2011If the permanent has multiple kinds of counters, you choose how many of each to remove when the ability resolves.