Koa'ki Meiru Wall [BP03-EN081] 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 Spell Card: You can tribute this card; negate the activation, and if you do, destroy that card.