Convincing Mirage

• WWizards of the Coast2009-10-01
  Official Ruling
  The affected land loses its existing land types and any abilities printed on it. It becomes the chosen basic land type and now has the ability to tap to add one mana of the appropriate color. Convincing Mirage's ability doesn't change the affected land's name or whether it's legendary or basic.

Rulings via Scryfall