Koa'ki Meiru Sea Panther (SOVR-EN027) - Stardust Overdrive Unlimited

The controller of this card sends 1 Iron Core of Koa'ki Meiru from their hand to the Graveyard or reveals a WATER monster in their hand during each of their End Phases. If they do not this card is destroyed. Once per turn by sending 1 Iron Core of Koa'ki