Other Zombie creatures have swampwalk. (They can't be blocked as long as defending player controls a Swamp.)
Other Zombies have "{B}: Regenerate this permanent."

Zombie Master

Aetherdrift Commander

He controlled the zombies even before his own death; now nothing can make them betray him.

Mystery Booster 2

Not even the cold embrace of death could keep him from his Prerelease events.

Wizards Play Network 2024

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.

30th Anniversary Edition

Classic Sixth Edition