
Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)
Marsh Boa has 1 printing, first in Prophecy (2000). EDHREC ranks it #20,212 among Commander cards. It appears most in Aphelia, Viper Whisperer decks (1,330 on EDHREC).
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.