This is related to a question in Cranial Extraction today, but isn't really answered there.
I control a Grizzly Bear with Indestructibility on it and then cast another Indestructibility on the existing Indestructibility. I then cast Aura Graft targeting the Indestructibility on the Grizzly Bear and attach it to it the other Indestructibility. What happens?
I control a Grizzly Bear with Indestructibility on it and then cast another Indestructibility on the existing Indestructibility. I then cast Aura Graft targeting the Indestructibility on the Grizzly Bear and attach it to it the other Indestructibility. What happens?
They'll both be indestructible. The grizzly bear will no longer be enchanted or indestructible.