This ability changes the targeted land’s land types. It doesn’t affect its name, its supertypes (such as whether or not it’s legendary, snow, or basic), or its other types (if it’s also a creature, for example). The ability will cause the land to lose all of its printed abilities and gain the ability “{T}: Add {B}.”
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.