Eldritch Moon

As long as you control a planeswalker named Nahiri, the Harbringer, Eldritch Moon costs {5} less to cast and you may cast it as though it were an instant.
Put twenty 0/1 colorless Cryptolith creature tokens onto the battlefield with Indestructible and "Sacrifice this creature: Piss off Sorin."
Is this what you used to destroy Innistrad Nahiri? Pathetic.
-Sorin to Nahiri.