Cheapest priced copy (Darksteel): $0.35 at Card Kingdom, near mint, their price list as of .
Karstoderm 
Creature — Beast · 0/0 · Uncommon · Darksteel · #77
This creature enters with five +1/+1 counters on it.
Whenever an artifact enters, remove a +1/+1 counter from this creature.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper