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| image name = IronCoreofKoa'kiMeiruVG-TF04-JP.png

| portuguese = Koa'ki Meiru

The majority of their effects center around manipulating the [[Iron Core of Koa'ki Meiru]] or revealing one in hand to activate an effect. The strongest of the monsters require a maintenance cost in the form of sending an Iron Core to the grave or revealing a monster of the same type. There are exceptions such as that of [[Koa'ki Meiru Powerhand]], where you must reveal a [[Normal Trap Cards|Normal Trap Card]].

The theme was initially designed to bring down the dominating decks Decks of over 2 banlists therefore centering around heavy control elements. Seeing as the meta was ''completely'' dominated by [[LIGHT]] and [[DARK]] decksDecks, effects specifically targeted both Attributes therefore bringing about a specific Meta, Anti Meta theme. Because of their high [[ATK]], 11 Level 4 monsters from 1900 ATK, topping out at 3000 ([[Koa'ki Meiru Valafar]]), and the nature of the new support, the theme has taken a more aggressive approach with powerful beatdown elements, namely [[Koa'ki Meiru Rooklord]] and [[Koa'ki Meiru Urnight]].

Generally speaking, there are two ways to use Koa'ki Meiru cards. The most obvious is to simply use a dedicated deckDeck; the other being to use individual Koa'ki Meiru monsters as a supplement to Type specific decks Decks of their type, giving an [[Anti-Meta]], controlling aspect to it as well as being able to maintain it through the alternative maintenance cost; for example, using [[Koa'ki Meiru Drago]] in a [[Dragon]] type deck Deck as seen in [[Disaster Dragon]] builds.

In order to run a Koa'ki Meiru deckDeck, no matter the style, you'll need multiple ways to retrieve the [[Iron Core of Koa'ki Meiru]] from your deck Deck and graveyard Graveyard such as [[Koa'ki Meiru Boulder]], [[Koa'ki Meiru Crusader]], and [[Core Transport Unit]]. [[Iron Core Immediate Disposal]] is also nice mid game, after building up resources in hand. You must also be wary of keeping more on field than you can maintain. Your field should max out at 2 Koa'Ki Meiru's requiring maintenance with multiple Cores in play as well as an alternative cost ready in hand.

You can also play a RFG Koa'ki Meiru deckDeck. Ghoulungulate can protect your monsters while setting you up for [[Return from the Different Dimension]]. Milling elements are recommended to load your grave. The set up takes time so you can use Royal Oppression as you aren't in any rush. Cyber Valley is also a great asset to the deckDeck.

Because [[Iron Core of Koa'ki Meiru]] may often be in the graveyardGraveyard, it is vulnerable to cards that can remove it from play, such as [[Gladiator Beast Retiari]], and [[Macro Cosmos]]. Also, having multiple Koa'ki Meiru monsters on the field at once can be extremely dangerous, as each one would require you to reveal or discard a card from your hand at the End Phase; leaving hand and field advantage very hard to maintain, unless multiple copies are used (for example, 3 Koa'ki Meiru Powerhands only require 1 Normal Trap Card revealed). Koa'ki Meirus are very reliant on the hand and so cards like [[Card Destruction]], [[Mind Crush]] or [[D.D. Designator]] can completely disrupt the player's strategy, and cards like [[Trap Dustshoot]] or even [[Des Koala]] deal serious damage.

Hand Control decks Decks present the biggest threat by being able to specifically remove assets essential to the deckDeck.

This deck Deck revolves around [[Anti-Meta]]. Obviously, the most important card needed in the deck Deck is "[[Iron Core of Koa'ki Meiru]]", so having three in your deck Deck is a must. Most of the monsters are used against [[Effect Monsters]], mostly [[DARK]] and [[LIGHT]] monsters, since they are the commonly used decks Decks ([[Infernities]], [[Lightsworns]], [[Blackwings]] etc.). Most Koa'ki Meiru decks Decks should focus on [[Rock]]-[[Type]] and [[Beast-Warrior]]-[[Type]] monsters, using other Types according to the deckDeck's main strategy.

Often overlooked is the fact that you can use "[[Iron Core Armor]]" to substitute for the maintenance cost of Koa'ki Meiru monsters. The main advantage of including "[[Iron Core Armor]]" in your deck Deck is that there exists plenty of support for [[Equip Spell CardsCard]]s. For example, using "[[Hidden Armory]]" to search for "[[Iron Core Armor]]" from your deck Deck or graveyard Graveyard may cause you to have one Koa'ki Meiru monster sent to your graveyardGraveyard, which could be used to fuel the effect of "[[Koa'ki Meiru Ghoulungulate]]".

With the release of the [[Machine Emperors]] in the [[OCG]] the Koa'ki Meiru can evolve and expand their [[Anti-Meta]] to an anti-synchro level, the advantage of running the machine emperors lies in the self-destruction effects that is common among the koa'ki meiru and also that all of them except [[Machine Meklord Emperor Wisel Infinity∞]] are not [[DARK]] or [[LIGHT]] attribute rending them immune to the [[Anti-Meta]] effects shared among the archetype. while also combining with the effect of [[Iron Core Specimen Lab]] to search for key monsters such as [[Koa'ki Meiru Urnight]].

* [[Koa'ki Meiru Urnight]] and [[Koa'ki Meiru Crusader]] share the [[Beast-Warrior]] type, and reveal requirement, while allowing for a good presence on the field and card advantage.

* [[Koa'ki Meiru Wall]], [[Koa'ki Meiru Sandman]], [[Koa'ki Meiru Guardian]], [[Koa'ki Meiru Boulder]], [[Koa'ki Meiru Prototype]] and [[Gigantes]] can be extremely aggressive when combined, as well as controlling the field and hand.

* [[Koa'ki Meiru Maximus]] can be used as the reveal cost for [[Koa'ki Meiru Drago]]. Drago's effect serves as disruption, while you gather [[Iron Core of Koa'ki Meiru]] for Maximus's final push for game.

* [[Koa'ki Meiru Doom]] and [[Koa'ki Meiru Valafar]] also work together, usually on its own deck Deck revolving around [[Evil Hero Dark Gaia]] and [[Dark Fusion]].

* [[Koa'ki Meiru Ghoulungulate]] has a protection effect, which can be achieved easily by building up a good graveyard Graveyard size with [[Iron Core Specimen Lab]] and [[Koa'ki Meiru Urnight]]. [[Koa'ki Meiru Ghoulungulate]] can easily be brought out with [[Pyramid Turtle]]'s effect, and keeps a good Tribute fodder for [[Koa'ki Meiru Rooklord]]. Since both [[Remove from Play]], [[Burial from a Different Dimension]], and [[Return from the Different Dimension]] can be very powerful.

Finally, a few cards have a usually heavy cost of discarding a [[Spell Card]] from your hand (like [[Summoner Monk]], [[Cursed Seal of the Forbidden Spell]] and [[Chiron the Mage]]), but Koa'ki Meiru decks Decks can recycle the [[Iron Core of Koa'ki Meiru]] as long as they want to, making these much more consistent than any other deckDeck.

* [[Koa'ki Meiru Urnight]]

* [[Koa'ki Meiru Urnight]]

* [[Koa'ki Meiru Urnight]]

* [[Reckless Greed]] * [[Dimensional Prison]]

* [[Royal Oppression]] * [[Mirror Force]]