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.
Masters of Shadow
Joey Wheeler (DSOD) Unlock Event - Memories of a Friend
3rd Anniversary Campaign
Selection Box Vol. 03
Special Gift Campaign
Train Your Kuriboh! Campaign
25th Mini Box: Masters of Shadow
PvP Best decks [22 January Updated]
King of Game decks [Jan 2020]
Joey Wheeler (DSOD)
Gearfried the Red-Eyes Iron Knight
Dark Magician: deck recipe [Jan 2020 Updated]
Shiranui Synchro: deck recipe [Jan 11 Updated]
Masked HERO: deck recipe [Jan 20 Updated]
Darklord Deck: deck recipe [Dec 2019 Updated]
Dragunity Synchro: deck recipe [Jan 2020 Updated]
Gjallarhorn | Deck and Rulings
Leodrake's Mane | Deck and Rulings
Ventdra, the Empowered Warrior | Deck and Rulings
Sasuke Samurai #4 | Deck and Rulings