During your Draw Phase, if this card is in your Graveyard, you can add this card to your hand instead of drawing, and/or send 1 "Koa'ki Meiru" monster from your hand to your Graveyard to add this card to your hand.
Use these cards to search out Iron Core of Koa'ki Meiru from your deck.
Many powerful Iron Core support cards require you to have Iron Core of Koa'ki Meiru in your hand or to use as cost. Here are some of them.
Tristan Taylor Lvl 40 (Gate)
Fantastic Pegasus Roaming Event
Guardians of Rock
Train Your Kuriboh! Campaign
2nd Anniversary Campaign
PvP Best decks [25 June Updated]
Dark Magician: deck recipe (After 2019 June)
Kalin Kessler Unlock Event
Upcoming events/updates [July 2019]
King of Game decks [May 2019]
Cyber Angel Izana
King of Game decks [June 2019]
Cyber Angel: deck recipe (After 2019 June~)
Red-Eyes Fusion: deck recipe
Electromagnet: deck recipe
Cyber Angel Dakini | Decks and Ruling
Six Samurai Synchro: deck recipe
Magician's Rod | Decks and Tips