Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
All monsters your opponent controls lose 300 ATK/DEF for each "Naturia" monster you control. Once per turn: You can target 1 monster your opponent controls with 0 DEF; take control of that target until the End Phase.
--ナチュル・フライトフライ
--Naturia Fruitfly
local s,id=GetID()
function s.initial_effect(c)
	--atk,def
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetRange(LOCATION_MZONE)
	e1:SetTargetRange(0,LOCATION_MZONE)
	e1:SetCode(EFFECT_UPDATE_ATTACK)
	e1:SetValue(s.val)
	c:RegisterEffect(e1)
	local e2=e1:Clone()
	e2:SetCode(EFFECT_UPDATE_DEFENSE)
	c:RegisterEffect(e2)
	--control
	local e3=Effect.CreateEffect(c)
	e3:SetDescription(aux.Stringid(id,0))
	e3:SetCategory(CATEGORY_CONTROL)
	e3:SetType(EFFECT_TYPE_IGNITION)
	e3:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e3:SetRange(LOCATION_MZONE)
	e3:SetCountLimit(1)
	e3:SetTarget(s.ctltg)
	e3:SetOperation(s.ctlop)
	c:RegisterEffect(e3)
end
s.listed_series={SET_NATURIA}
function s.val(e,c)
	return Duel.GetMatchingGroupCount(aux.FaceupFilter(Card.IsSetCard,SET_NATURIA),e:GetOwnerPlayer(),LOCATION_MZONE,0,nil)*-300
end
function s.filter(c)
	return c:IsFaceup() and c:IsDefenseBelow(0) and c:IsControlerCanBeChanged()
end
function s.ctltg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_MZONE) and chkc:IsControler(1-tp) and s.filter(chkc) end
	if chk==0 then return Duel.IsExistingTarget(s.filter,tp,0,LOCATION_MZONE,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_CONTROL)
	local g=Duel.SelectTarget(tp,s.filter,tp,0,LOCATION_MZONE,1,1,nil)
	Duel.SetOperationInfo(0,CATEGORY_CONTROL,g,1,0,0)
end
function s.ctlop(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc:IsRelateToEffect(e) and tc:IsFaceup() and tc:IsDefenseBelow(0) then
		Duel.GetControl(tc,tp,PHASE_END,1)
	end
end