Gizmek Okami, the Dreaded Deluge Dragon

You can pay 1500 LP; destroy all monsters on the field that were Special Summoned from the Extra Deck, also you can only attack with 1 monster this turn. You can only use each of the following effects of "Gizmek Okami, the Dreaded Deluge Dragon" once per turn. If 2 or more monsters Special Summoned from the Extra Deck are on the field: You can Special Summon this card from your hand. If this card in your possession is sent to your GY by an opponent's card: You can banish 1 monster from your opponent's GY, then gain LP equal to its ATK.