| Koa'ki Meiru
|Appears in (sets)|
Most effects of these cards are targeted to send "Iron Core of Koa'ki Meiru "or revealing a card in your hand (Except for "Core Chimair Valafar" who doesn't give a revealing option). Also, if the controller doesn't send or reveal any card from the above, that Koa'ki Meiru is destroyed.
All of the "Koa'ki Meiru" have the same mark on their chest.
The main strategy of the "Koa'ki Meiru" is Anti-Meta - A Deck build which oppose the popular Decks that are played. For example, "Core Chimair Drago's" effect was designed specially to oppose "Lightsworn, Dark Armed Return, and "Blackwing" Decks for their Swarming capabilities.
An effective way to utilize their capabilities without having to discard a "Iron Core of Koa'ki Meiru" every round, is to place a second copy of each "Koa'ki Meiru" monster you utilize. Since each of the weaker "Koa'ki Meiru's" merely requires you to reveal a monster of their Type simply revealing the same monster turn after turn will make you capable of continuous use of your "Koa'ki Meiru" monsters on the field. And with "Iron Core of Koa'ki Meiru" you're able to switch out for a new "Koa'ki Meiru" the very next turn, if your monster is destroyed.
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, Macro Cosmos, and the latter. 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.