'''Koa'ki Meiru''', sometimes romanized as '''Core Chimair''' (a combination of the words "Core" and "Chimera," is a theme from [[Raging Battle]], [[Ancient Prophecy]], [[Stardust Overdrive]], [[Absolute Powerforce]], and [[The Shining Darkness]]). However , the support card "[[Koa'ki Ring]]" and other anti-meta cards appear in [[Starstrike Blast]].

The majority of their effects center around manipulating the "[[Iron Core of Koa'ki Meiru]] " or [[reveal]]ing one in your hand to activate an effect. The strongest Almost all 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 Card]], or "[[Koa'ki Meiru Valafar]]" where you have to send an "Iron Core of Koa'Ki Meiru" and cannot reveal any card in your hand instead.

Koa'ki Meirus Meiru are all [[EARTH]], [[WIND]], [[WATER]] or [[FIRE]] attributesattribute monsters, rendering them immune to their own control based effects which often affect [[LIGHT]] and [[DARK]] monsters. All of the "Koa'ki Meiru" have the same mark (3 dragons) on some part of their body or on a weapon they have. Also, many Koa'ki Meiru and related cards' artwork uses yellow, orange, and red, except for "[[Koa'ki Meiru Ghoulungulate]]".

The theme was initially designed to bring down the dominating Decks of over 2 banlists and therefore centering centered around heavy control elements. Seeing as the meta was ''completely'' dominated by [[LIGHT]] and [[DARK]] Decks, 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 simply to simply use a dedicated Deck; the other being way is to use individual the Koa'ki Meiru monsters as a supplement to Type specific 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 as seen in [[Disaster Dragon]] builds.

In order to run a Koa'ki Meiru Deck, no matter the style, you'll need multiple ways to retrieve the [[Iron Core of Koa'ki Meiru]] from your Deck and Graveyard such as . Good cards for this include "[[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 your hand. You must also be wary of keeping more on field than you can maintain. Your field should max out at 2 Koa'Ki ki Meiru's requiring maintenance with multiple Cores in play as well as an alternative cost ready in hand. To maintain hand advantage, you could make use of "[[Forced Requisition]]": every time you discard a card from your hand for a card effect, your opponent must discard as well-this helps keep your opponent's hand advantage to a minimum.

Beatdown uses a different lineup, using a minimum of control but only the best in the form of "[[Koa'ki Meiru Rooklord|Rooklord]] " and "[[Koa'ki Meiru Drago|Drago]]". The main attackers being are "[[Koa'ki Meiru Bergzak]]","[[Koa'ki Meiru Powerhand]] " and "[[Koa'ki Meiru Rooklord]]". With the addition of "[[Koa'ki Meiru Urnight]] " from [[Absolute Powerforce]], you gain a swarm/toolbox element. "[[Koa'ki Meiru Ghoulungulate]] " is nice protection but your tribute fodder is best used on Rooklord. SSpell/t Trap protection is a better option.

You can also play a an RFG Koa'ki Meiru Deck. "Ghoulungulate " can protect your monsters while setting you up for "[[Return from the Different Dimension]]". Self-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 a rush. "[[Cyber Valley ]]" is also a great asset to the Deck.

Because "[[Iron Core of Koa'ki Meiru]] " may often be in the Graveyard, 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 a card or discard a card from your hand at the End Phase; leaving your 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). A good way to avoid problems with this is to keep a duplicate of the specific monsters in your hand-usually, Koa'Ki Meiru Monsters require you to reveal a monster of the same type, so you can reveal a duplicate or another Koa'ki Meiru of the same type. 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]] " can deal serious damage.

Amazingly, one way to beat the Koa'ki Meiru format is to have the opponent permanently reveal their hand to you on their turns in order to make them either discard an "Iron Core of Koa'ki Meiru " or destroy the card, since they cannot "reveal" the card to you. Such cards include "[[Respect Play]] " and "[[Ceremonial Bell]]". [[Remove from play]] Decks can remove "[[Iron Core of Koa'ki Meiru]]" and so you have to rely on your revealing effect. It To protect yourself from this, it is best a good idea to have "[[Necrovalley]] " and a "[[Burial from a Different Dimension]] " in your [[Side Deck]].

This Deck revolves around [[Anti-Meta]]. Obviously, the most important card needed in the Deck is "[[Iron Core of Koa'ki Meiru]]", so having three in your 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 ([[Infernities]], [[Lightsworns]], [[Blackwings]] etc.). Most Koa'ki Meiru Decks should focus on [[Rock]]-[[Type]] and [[Beast-Warrior]]-[[Type]] monsters, using other Types according to the Deck's main strategy.

"[[Trade-In]] " can work well if you are using "[[Beast King Barbaros]] " to reveal for "[[Koa'ki Meiru Urnight]] " and "[[Koa'ki Meiru Crusader]]". Other level 8 monsters to work with "[[Trade-In]] " are "[[Koa'ki Meiru Valafar]], " and "[[Koa'ki Meiru Maximus]]". Maximus can also reveal be revealed for "[[Koa'ki Meiru Drago]] " and Valafar is a strong beatstick that is immune to "[[Torrential Tribute]]", "[[Bottomless Trap Hole]]", "[[Mirror Force]]", "[[Call of the Haunted]]", and "[[Core Reinforcement]]".

It would be wise to include cards that return monsters and other cards to yours your or your opponents handsopponent's hand. Copies of For example, "[[Compulsory Evacuation Device]] " or "[[Penguin Soldier]], for example, " can both remove threats from the field or keep a Koa'ki Meiru alive for a turn, or even using him it for the maintenance.

Usual Anti-Meta tricks like "[[Grave of the Super Ancient Organism]] " or "[[Royal Oppression]] works " work fairly well, since Koa'ki Meirus can mantain mantian a solid game even without Special Summoning.

Although most Koa'ki Meiru monsters have difficulty staying on the field, a few of them work incredibly well together, sharing types, or common reveals that help ensure their survival on the field.

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 Synchro level, the advantage of running the machine emperors Machine Emperors lies in the self-destruction effects that is common among the koaKoa'ki meiru Meiru and also that all of them except ["[Meklord Emperor Wisel ∞]] " are not [[DARK]] or [[LIGHT]] attribute rending , rendering 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 " are [[Beast-Warrior]] -type, monsters and have the same 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. Wall, Sandman, and Guardian all have effect negation abilities: they are used for a Rock Stun deck. Boulder and Prototype are both extremely useful for Koa'ki Meiru monsters because they do not require the normal sacrifice-Boulder is used to search for other Koa'Ki Meiru monsters or Iron Cores, while Prototype can sacrifice itself to prevent a Koa'ki Meiru monster from being destroyed during the end phase of the turn.

* "[[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 in a different Deck revolving around "[[Evil Hero Dark Gaia]] " and "[[Dark Fusion]]".

* "[[Koa'ki Meiru Speeder]] " can null the costs for "[[Koa'ki Meiru Tornado]] " and "[[Koa'ki Meiru Hydro Barrier]]", as well as working with "[[Koa'ki Meiru Powerhand]] " due to their high ATK and DEF and low Levels.

* "[[Koa'ki Meiru Ghoulungulate]] " has a protection effect, which can be easily achieved easily by building up a good 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 the 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 can recycle the "[[Iron Core of Koa'ki Meiru]] " as long as they want to, making these much more consistent than any other Deck.