This card cannot be Normal Summoned or Set. This card can only be Special Summoned by removing from play 1 "Iron Core of Koa'ki Meiru" from your hand. During each of your End Phases, destroy this card unless you send 1 "Iron Core of Koa'ki Meiru" or 1 "Koa'ki Meiru" monster from your hand to the Graveyard. Once per turn, during your Main Phase, you can select and destroy 1 card your opponent controls.
You need banish Iron Core of Koa'ki Meiru from your hand to Special summon Koa'ki Meiru Maximus. Search out Iron Core of Koa'ki Meiru with Koa'ki Meiru Boulder, Koa'ki Meiru Initialize!, Diamond Core of Koa'ki Meiru, or Core Transport Unit. Diamond Core of Koa'ki Meiru can even be reused to sustain Koa'ki Meiru Maximus on the field by protecting him from destruction. You can also use Iron Core Immediate Disposal to send Iron Core of Koa'ki Meiru from your deck to the graveyard. And then add Iron Core of Koa'ki Meiru to your hand with it's own effect.
It's all Konami's plan. Amazoness Onslaught was once not popular until Konami released Amazoness Princess. GameA rated Maximus as B- , but after Konami released Diamond Core Maximus became one of the most overused card in the ladder. I won't be surprised if Maximus fate would be the same as Onslaught. Hello banlist.