Koa'ki Meiru Guardian is a Super Rare Effect Monster card from Yu-Gi-Oh! (Duelist Pack Collection Tin 2009, RGBT). Current market price: $1.39.
Super Rare
Duelist Pack Collection Tin 2009 (RGBT)
Card Text
During each of your End Phases, destroy this card unless you send 1 "Iron Core of Koa'ki Meiru" from your hand to the GY or reveal 1 Rock monster in your hand. When a monster effect is activated (Quick Effect): You can Tribute this card; negate the activation, and if you do, destroy that monster.
