Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Once per turn: You can banish 1 Dragon monster from your GY, then target 1 monster you control; it gains 700 ATK until the end of this turn (even if this card leaves the field). When this face-up card on the field is sent to the GY: You can target 1 of your banished Dragon monsters; Special Summon that target. You can only control 1 "Castle of Dragon Souls".
--竜魂の城
--Castle of Dragon Souls
local s,id=GetID()
function s.initial_effect(c)
	c:SetUniqueOnField(1,0,id)
	--activate
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetProperty(EFFECT_FLAG_DAMAGE_STEP)
	e1:SetHintTiming(TIMING_DAMAGE_STEP)
	e1:SetCost(s.cost)
	e1:SetCondition(aux.StatChangeDamageStepCondition)
	e1:SetTarget(s.target)
	c:RegisterEffect(e1)
	--atkup
	local e2=Effect.CreateEffect(c)
	e2:SetCategory(CATEGORY_ATKCHANGE)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetType(EFFECT_TYPE_QUICK_O)
	e2:SetCode(EVENT_FREE_CHAIN)
	e2:SetRange(LOCATION_SZONE)
	e2:SetProperty(EFFECT_FLAG_DAMAGE_STEP+EFFECT_FLAG_CARD_TARGET)
	e2:SetHintTiming(TIMING_DAMAGE_STEP)
	e2:SetCondition(aux.StatChangeDamageStepCondition)
	e2:SetCost(s.atkcost)
	e2:SetTarget(s.atktg)
	e2:SetOperation(s.atkop)
	c:RegisterEffect(e2)
	--spsummon
	local e3=Effect.CreateEffect(c)
	e3:SetDescription(aux.Stringid(id,1))
	e3:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e3:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e3:SetCode(EVENT_TO_GRAVE)
	e3:SetProperty(EFFECT_FLAG_DAMAGE_STEP+EFFECT_FLAG_CARD_TARGET)
	e3:SetCondition(s.spcon)
	e3:SetTarget(s.sptg)
	e3:SetOperation(s.spop)
	c:RegisterEffect(e3)
end
function s.cost(e,tp,eg,ep,ev,re,r,rp,chk)
	e:SetLabel(1)
	if chk==0 then return true end
end
function s.cfilter(c,tp)
	return c:IsRace(RACE_DRAGON) and c:IsAbleToRemoveAsCost() and aux.SpElimFilter(c,true) 
		and Duel.IsExistingTarget(Card.IsFaceup,tp,LOCATION_MZONE,0,1,c)
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	local label=e:GetLabel()
	if chkc then return s.atktg(e,tp,eg,ep,ev,re,r,rp,0,chkc) end
	if chk==0 then
		if Duel.IsPhase(PHASE_DAMAGE) then
			if label==1 then e:SetLabel(0) end
			return (label~=1 or s.atkcost(e,tp,eg,ep,ev,re,r,rp,0)) and s.atktg(e,tp,eg,ep,ev,re,r,rp,0)
		end
		return true
	end
	if (label~=1 or s.atkcost(e,tp,eg,ep,ev,re,r,rp,0)) and s.atktg(e,tp,eg,ep,ev,re,r,rp,0) 
		and (Duel.IsPhase(PHASE_DAMAGE) or Duel.SelectYesNo(tp,aux.Stringid(id,2))) then
		e:SetCategory(CATEGORY_ATKCHANGE)
		e:SetProperty(EFFECT_FLAG_DAMAGE_STEP+EFFECT_FLAG_CARD_TARGET)
		e:SetOperation(s.atkop)
		if label==1 then
			s.atkcost(e,tp,eg,ep,ev,re,r,rp,1)
		end
		s.atktg(e,tp,eg,ep,ev,re,r,rp,1)
	else
		e:SetCategory(0)
		e:SetProperty(EFFECT_FLAG_DAMAGE_STEP)
		e:SetOperation(nil)
	end
end
function s.atkcost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.cfilter,tp,LOCATION_MZONE|LOCATION_GRAVE,0,1,nil,tp) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_REMOVE)
	local rg=Duel.SelectMatchingCard(tp,s.cfilter,tp,LOCATION_MZONE|LOCATION_GRAVE,0,1,1,nil,tp)
	Duel.Remove(rg,POS_FACEUP,REASON_COST)
end
function s.atktg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsControler(tp) and chkc:IsLocation(LOCATION_MZONE) and chkc:IsFaceup() end
	if chk==0 then return e:GetHandler():GetFlagEffect(id)==0
		and Duel.IsExistingTarget(Card.IsFaceup,tp,LOCATION_MZONE,0,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_TARGET)
	Duel.SelectTarget(tp,Card.IsFaceup,tp,LOCATION_MZONE,0,1,1,nil)
	e:GetHandler():RegisterFlagEffect(id,RESETS_STANDARD_PHASE_END,0,1)
end
function s.atkop(e,tp,eg,ep,ev,re,r,rp)
	if not e:GetHandler():IsRelateToEffect(e) then return end
	local tc=Duel.GetFirstTarget()
	if tc:IsRelateToEffect(e) and tc:IsFaceup() then
		local e1=Effect.CreateEffect(e:GetHandler())
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_UPDATE_ATTACK)
		e1:SetValue(700)
		e1:SetReset(RESETS_STANDARD_PHASE_END)
		tc:RegisterEffect(e1)
	end
end
function s.spcon(e,tp,eg,ep,ev,re,r,rp)
	return e:GetHandler():IsPreviousLocation(LOCATION_ONFIELD) and e:GetHandler():IsPreviousPosition(POS_FACEUP)
end
function s.spfilter(c,e,tp)
	return c:IsFaceup() and c:IsRace(RACE_DRAGON) and c:IsCanBeSpecialSummoned(e,0,tp,false,false)
end
function s.sptg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsControler(tp) and chkc:IsLocation(LOCATION_REMOVED) and s.spfilter(chkc,e,tp) end
	if chk==0 then return Duel.GetLocationCount(tp,LOCATION_MZONE)>0
		and Duel.IsExistingTarget(s.spfilter,tp,LOCATION_REMOVED,0,1,nil,e,tp) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
	local g=Duel.SelectTarget(tp,s.spfilter,tp,LOCATION_REMOVED,0,1,1,nil,e,tp)
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,g,1,0,0)
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc and tc:IsRelateToEffect(e) then
		Duel.SpecialSummon(tc,0,tp,tp,false,false,POS_FACEUP)
	end
end