Koa'ki Meiru Gravirose

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 Plant-Type monster in you hand. During each of your Standby Phases, you can send 1 Level 3 or lower monster from your Deck to your Graveyard.