Koa'ki Meiru Hydro Barrier

[ Aqua / Effect ] You can return 1 "Iron Core of Koa'ki Meiru" from your hand to the top of the Deck. If you do, the effect(s) of all face-up Effect Monsters are negated until the Standby Phase of your next turn, except "Koa'ki Meiru" monsters. ATK/ 1000 DEF/ 1900