Zombies are the perfect marshland fighters—they don't need to breathe and they don't care what they step in.

Magic 2011

Bog Raiders

Swampwalk (This creature is unblockable as long as defending player controls a Swamp.)

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

Those who live amid decay must expect scavengers.

Swampwalk (This creature is unblockable as long as defending player has a swamp in play.)

"Let weak feed on weak, that we may divine the nature of strength."
—*Phyrexian Scriptures*

Swampwalk (If defending player controls a swamp, this creature is unblockable.)

Swampwalk (If defending player has any swamps in play, Bog Raiders can't be intercepted.)