YGOEffect Monster
Koa'ki Meiru Guardian
Market price by printingCurrent & per-set prices are free
5 printings
$1.83
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See Premium →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.