“Koa'ki Meiru” is a very unique archetype that features a lot of different cards. The vast majority of the archetype self-destructs during the End Phase unless you send an Iron Core of Koa'ki Meiru a certain type of card from your hand, so they are generally difficult to keep on the field, but their powerful effects make up for it.
This is a Koa'ki Meiru Deck that focuses mainly on Koa'ki Meiru Rooklord, a Level 7 Warrior-Type monster that has the ability to destroy up to 2 cards on your opponent’s side of the field.
Although Koa'ki Meiru Rooklord is Level 7, you can Summon it by Tributing 1 “Koa'ki Meiru” monster. When Rooklord is Normal Summoned, you can banish a “Koa'ki Meiru” card from your Graveyard to destroy up to 2 cards your opponent controls. Rooklord’s effect does target the card it destroys, but that doesn’t really matter in the current meta.
You can use Arrivalrivals to Summon Rooklord during the Battle Phase for a quick OTK or to respond to an opponent’s card effect.
Maximus is the alternative winning condition of the deck. You are probably already familiar with this card: it’s a Level 8 monster that can be Special Summoned from your hand by banishing a copy of Iron Core of Koa'ki Meiru from your hand.
Summon Maximus, use its effect to destroy a card on your opponent’s side of the field and then Tribute it to Summon Rooklord.
Core Reinforcement can Special Summon any of your monsters, with the exception of Koa'ki Meiru Maximus, from the Graveyard. Keep in mind that Koa'ki Meiru Rooklord’s effect does not trigger on Special Summon.
When the monster Special Summoned by Core Reinforcement is destroyed during the End Phase, you take damage equal to its ATK, but, if the monster is destroyed in any other instance, you don’t. Use Core Reinforcement to bring back Sandman from the Graveyard and then use its effect to negate a Trap Card.
The Tie that Binds Until the end of you turn, the ATK of all face-up monsters on your field increases by the number of monsters on your field times 100. This skill can only be used once per turn.