Necropolify

Target land you control loses all subtypes
and abilities and gains "{t}: Add {b}" and
"{3}{b}, {t}: Return target creature from your graveyard to the battlefield except it's a
black Zombie with decay in addition to its other colors, types, and abilities."
"Suddenly a wave of darkness engulfed the city, and
when the darkness cleared, it was no longer a city, but
a necropolis of undead."