Koa'ki Meiru War Arms (RGBT-EN081) - Raging Battle Unlimited

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. Once per turn, you can select 1 Level 3 or lower Warrior-Type monster in your Grav