Sheogorath, the Madgod

Vanishing 3, Mentor
When Sheogorath, the Madgod dies, create
Jyggalag, a legendary 4/4 colorless Deadric God creature token with trample.
"You're going to stop the Greymarch by becoming Me.
Or a version of Me. You'll be powerful.
Powerful enough to stop Jyggalag."