Cheapest priced copy (Lorwyn Eclipsed Commander): $0.35 at Card Kingdom, near mint, their price list as of .
Kulrath Knight 
Creature — Elemental Knight · 3/3 · Uncommon · Shadowmoor · #190
Flying
Wither (This deals damage to creatures in the form of -1/-1 counters.)
Creatures your opponents control with counters on them can't attack or block.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
3 printings · $0.35 to $11.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Lorwyn Eclipsed Commander | 126 | Uncommon | $0.35 | — |
| The List | SHM-190 | Uncommon | — | $0.49 |
| Shadowmoor | 190 | Uncommon | $0.49 | $11.99 |
One ruling from Wizards of the Coast
- 1 May 2008This checks your opponents' creatures for any kind of counters, not just -1/-1 counters.