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 in your hand. You can Tribute Summon this card by Tributing 1 'Koa'ki Meiru' monster. When this card is Normal Summoned, you can remove from play 1 'Koa'ki Meiru' card in your Graveyard to destroy up to 2 cards your opponent controls.