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 Fiend-Type monster in your hand. Effects of LIGHT and DARK Effect Monsters that activate during the Main Phase are negated.
![Koa'ki Meiru Doom [RGBT-EN026] Common](http://www.cardmerchanttakapuna.co.nz/cdn/shop/products/f1472781-a2eb-59af-b2e2-6d3bfe60c3ea.png?v=1698542565&width=1445)