The Six Samurai - Zanji (SDWA-EN004) [Structure Deck: Samurai Warlords]

At the end of the Damage Step, if this card attacked: Destroy the monster this card attacked. You must control another "Six Samurai" monster with a different name to activate and to resolve this effect. If this card would be destroyed, you can destroy another face-up "Six Samurai" monster you control instead.