Other Zombie creatures have swampwalk. (They can't be blocked as long as defending player controls a Swamp.)
Other Zombies have ": Regenerate this permanent."
All zombies in play gain swampwalk and "ooB Regenerates" for as long as this card remains in play.
They say the Zombie Master controlled these foul creatures even before his own death, but now that he is one of them, nothing can make them betray him.
