Dryad of the Ilysian Grove

• WWizards of the Coast2020-01-24
  Official Ruling
  Each land you control will have the land types Plains, Island, Swamp, Mountain, and Forest. They’ll also have the mana ability of each basic land type (for example, Forests have “: Add .”). They’ll still have their other subtypes and abilities.
• WWizards of the Coast2020-01-24
  Official Ruling
  Dryad of the Ilysian Grove’s first ability is cumulative if you control more than one. It’s also cumulative with other effects that let you play additional lands, such as the one from Escape to the Wilds.
• WWizards of the Coast2020-01-24
  Official Ruling
  Giving a land additional basic land types doesn’t change its name or whether it’s legendary or basic.

Rulings via Scryfall