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Koa'ki Meiru Guardian
Rock / Effect
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. During either player's turn, when a monster effect is activated: You can Tribute this card; negate the activation, and if you do, destroy that monster.