Filth

Filth {3}{B}

Creature - Incarnation | Power/Toughness: 2 / 2
Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)
As long as Filth is in your graveyard and you control a Swamp, creatures you control have swampwalk.
Set: [JUD] Judgment ( U · #66 )