Athan, Guardian of War

: As long as your devotion to green is more than 8, Athan, Guardian of War is a 7/7 God creature with indestructible that's still a planeswalker.
+1: Create a 1/1 green Elf creature token or a 0/1 white flying Bird creature token.
-12: Destroy all other non-token, non-planeswalker permanents.