Advanced format ruling
Iron Core Specimen Lab
Card effect (current official text)During each of your End Phases, destroy this card unless you reveal 1 "Iron Core of Koa'ki Meiru" in your hand. Each time a "Koa'ki Meiru" monster on the field is destroyed during the End Phase, its owner can add 1 "Koa'ki Meiru" monster from their Deck to their hand.
Current rulings for this card are maintained by Konami.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Advanced forum — sourced change requests get reviewed.