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.