Gaia Plate the Earth Giant (SGX4-END01) - Speed Duel GX: Midterm Destruction 1st Edition

Once per turn, during your Standby Phase, banish 1 Rock monster from your GY or send this card to the GY. You can Special Summon this card (from your hand) by banishing 2 Rock monsters from your GY. If this card battles an opponent's monster, that monster's ATK/DEF become halved during damage calculation only.