During each of your End Phases, destroy this card unless you send 1 "Iron Core of Koa'ki Meiru" from your hand to the Graveyard or reveal 1 Warrior-Type monster in your hand. You can Tribute Summon this card by Tributing 1 "Koa'ki Meiru" monster. When this card is Normal Summoned, you can remove from play 1 "Koa'ki Meiru" card in your Graveyard to destroy up to 2 cards your opponent controls.
Will destroy itself if you don’t have the required cost.
Costly to summon.
Iron Core of Koa’ki Meiru
One of Koa’ki Meiru Rooklord’s possible maintenance cost is discarding a Iron Core of Koa’ki Meiru. Use Cards like Core Transport Unit or Iron Core Immediate Disposal to search it out. You can use Diamond Core of Koa’ki Meiru to search out Iron Core of Koa’ki Meiru. Diamond Core of Koa’ki Meiru can then later be banished to stop your Koa’ki Meiru monsters from destroying themselves.
Aside from using a Koa’ki Meiru monster as tribute to lessen the cost. Here are some other ways you can Normal summon Koa’ki Meiru Rooklord and still get to activate his effect. Use Cost Down and Amarylease together so that you do not need to tribute any monster on your field to summon Koa’ki Meiru Rooklord.