This is "Gold Standard" with a mutation. The mutation is white, green and lime green.
If you find a sport in your hosta. Carefully divide the hosta and remove the sport. Plant the sport as a separate new plant. It is important that the sport plant is stable and that it continues to regrow looking the same year after year. If it is stable and really different, you may have a new cultivar for the hosta market and one that can be registered with the American Hosta Society. To learn more about hostas consider joining the American Hosta Society (see the link).
Now go check that garden for a sport!
The Creative Gardener