Regal Supreme is a sport of Krossa Regal. It has a cream colored edge that turns white later in the season. It puts up tall scapes in late in the season.
Registry - http://www.hostaregistrar.org/detail.php?id=5635&Variety=Regal%20Supreme
MyHostas - http://myhostas.be/db/view/Regal+Supreme
Hosta Library - not in the library
I have been growing Regal Supreme in my front lawn garden since 2011.
Here it is when it first came in.
And flowers in 2012
And early 2013 - front lawn garden - bottom left corner