Wrath of Legend

(This spell isn't a legendary sorcery.)
Destroy all creatures. They can't be regenerated.
This spell can be your commander. (Start the game with it in the command zone. It doesn't go to the graveyard when put in the command zone. You may cast it from the command zone. If it would go to the graveyard or be exiled, you may instead put it in the command zone. It costs {2} more to cast each time after the first. All damage dealt by it to players is commander damage.)