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Generally speaking, there are two ways to use Koa'ki Meiru cards. The most obvious is simply to use a dedicated Deck; the other 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. 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. Cards that help thin the deck or dump the "Core" into the Graveyard help make the deck faster and more consistent. 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. With this in mind it would be wise to play multiple cards of the same Type, making your field easier to maintain. However, with the release of [[Xyz]] monsters, you can simply overlay any Koa'ki Meiru Monsters that you may not have a maintenance for.
Beatdown uses a different lineup, using a minimum of control but only the best in the form of "[[Koa'ki Meiru Rooklord]]" and "[[Koa'ki Meiru Drago]]". The main attackers 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. Spell/Trap protection is a better option.
Hand Control Decks present the biggest threat by being able to specifically remove assets essential to the Deck.
==Playing Tips==
This Deck revolves around [[Anti-Meta]]. Obviously, the most important card 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 the negation effects of "[[RockKoa'ki Meiru Wall]]-", "[[TypeKoa'ki Meiru Sandman]] ", and "[[Beast-WarriorKoa'ki Meiru Guardian]]-" and the card advantage and swarming effects of "[[TypeKoa'ki Meiru Crusader]]" and "[[Koa'ki Meiru Urnight]] monsters, " using the other Types Koa'ki Meiru Monsters according to the Deck's main strategy. In addition, "[[Koa'ki Meiru Ice]]" and "[[Koa'ki Meiru Tornado]]" are wonderful in punishing your opponent's powerful Special Summoned Monsters.
Koa'ki Meirus can also work well with support for [[Equip Spell Card]]s. Using cards like "[[Hidden Armory]]", "[[Iron Core Armor]]" can be recycled just as much as the "Iron Core" itself. "[[Core Blaster]]" is also extremely powerful, and even a single copy could destroy decks that focus heavily on [[LIGHT]] and [[DARK]] monsters. "[[Koa'ki Meiru Bergzak]]" works very well with any [[ATK]]-boosting effect, and "[[Iron Blacksmith Kotetsu]]" fits on the deck since it's a [[Beast-Warrior]].
Usual Anti-Meta tricks like "[[Grave of the Super Ancient Organism]]" or "[[Royal Oppression]]" work fairly well, since Koa'ki Meirus can maintain 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. However, because most are level 4, they can be used for an [[Xyz]] Summon before they are destroyed during the End Phase.
* "[[Koa'ki Meiru Urnight]]" and "[[Koa'ki Meiru Crusader]]" are [[Beast-Warrior]]-type monsters and have the same reveal requirement, while allowing for a good presence on the field and card advantage."Urnight" can Special Summon another level 4 "Koa'ki" from the Deck for a quick [[Xyz]] Summon and "Crusader" can recover "Urnight" after it has been detached.
* "[[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. Maximus is often a dead draw early on, however; and it is difficult to maintain once it hits the field, making it a very powerful but also very temperamental boss monster. Use with caution.
* "[[Koa'ki Meiru Doom]]" and "[[Koa'ki Meiru Valafar]]" also work together, usually in a different Deck revolving around "[[Evil Hero Dark Gaia]]" and "[[Dark Fusion]]".
Finally, a few cards have 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.
==Recommended Cards==
* [[Koa'ki Meiru Tornado]]
* [[Koa'ki Meiru Ice]]
* [[Gransoil Grandsoil the Spiritual Rock-Residing Elemental Lord]]
<u>Extra Deck</u>
* Any level 4 [[Xyz]] Monster
