Koa'ki Meiru Sandman [BP03-EN072] Rare

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 your opponent activates a trap card: You can Tribute this card to negate the activation, and if you do destroy this card.