Koa'ki Meiru Overload [SESL-EN051] Super Rare

Set: Secret Slayers Card type: Effect Monster Rarity: Super Rare Attack: 1900 Defense: 1200 During each of your End Phases, destroy this card unless you send 1 "Iron Core of Koa'ki Meiru" from your hand to the GY or reveal 1 Rock monster in your hand. When your opponent would Summon a monster(s) (Quick Effect): You can Tribute this card; negate the Summon, and if you do, destroy that monster(s).