Earthbound Servant Geo Grasha (Super Rare)

1 Earthbound Fusion Monster + 1 Earthbound Synchro Monster
Must be Fusion Summoned. At the start of the Damage Step, if this card battles a monster: Change that monster's ATK/DEF to 0. If a monster(s) in your opponent's possession is destroyed by battle or card effect: You can destroy all cards your opponent controls. You can only use this effect of Earthbound Servant Geo Grasha once per turn. If this face-up card in its owner's control leaves the field because of an opponent's card: You can Special Summon 1 Earthbound monster from your Deck or Extra Deck.