REDU format ruling
Iron Core Specimen Lab
Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
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.
Rulings
- Revealing "Iron Core of Koa’ki Meiru" is a maintenance cost to keep this card on the field.
- Both players can use the effect of this card. If the opponent activates the effect of this card, the effect is considered to be controlled by the controller for this card.
- There is no limit to the number of times you can activate this card’s effect in a single turn.
- If 2 "Koa’ki Meiru" monsters you control are destroyed simultaneously during the End Phase you can only activate this card’s effect once and add 1 "Koa’ki Meiru" monster to your hand.
- If 2 "Koa’ki Meiru" monsters, one you control and one your opponent controls, are destroyed at the same time, both players can activate this card’s effect. The effects will form a Chain. Chain Link 1 is the turn player’s effect.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.