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 Rock-Type monster in your hand. You can Tribute this card to negate the activation of an Effect Monster's effect and destroy that monster.
![Koa'ki Meiru Guardian [RGBT-EN023] Common | Game Master's Emporium (The New GME)](http://thenewgme.com/cdn/shop/products/d62aaaae-cae1-5694-8595-d1e4ea15ded6.png?v=1707421734)
