In the Envy line, Light Blonde is going to be the best match to Jon Renau's Laguna Blonde, but this is an unrooted shade whereas Laguna Blonde has golden-brown roots.
Envy does have a rooted blonde shade called Sparkling Champagne but it is a warmer blonde than Laguna Blonde.
Below, I have included the links to Heather's videos showcasing each of these shades:
Light Blonde: https://www.youtube.com/watch?v=iVBuk0KxE1Y
Sparkling Champagne: https://www.youtube.com/watch?v=L0PRARLdZZQ