Koa'ki Meiru Bergzak (TSHD-EN099) - The Shining Darkness Unlimited

During each of your End Phases, destroy this card unless you send 1 Iron Core of Koa'ki Meiru from your hand to the Graveyard or reveal 1 Warrior-Type monster from your hand. If this card destroys an opponent's monster by battle, it can attack once again