TSHD-EN087 – Core Overclock – Super Rare – Unlimited Edition

All face-up ‘Koa’ki Meiru’ monsters you control gain 500 ATK. Once per turn, during your Main Phase, you can discard 1 ‘Iron Core of Koa’ki Meiru’ to have all face-up ‘Koa’ki Meiru’ monsters you control gain 1000 ATK, until the End Phase.