Just making sure I am right in thinking that if someone Bile Blights a land that is a 4/4 Elemental from Nissa, it does not change its name to ‘Elemental,’ so it only affects the creatures from the same land, not all of the creature lands from Nissa's ability.

Yes, the name of the land is unchanged, only the creature type is changed by Nissa's ability.

Daniel Kitachewsky
L4, Paris, France
Rules NetRep