Cheapest priced copy (The List): $4.49 at Card Kingdom, near mint, their price list as of .
Filth 
Creature — Incarnation · 2/2 · Uncommon · The List · #JUD-66
Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)
As long as this card is in your graveyard and you control a Swamp, creatures you control have swampwalk.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper