Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
2 Level 1 monsters This card gains 200 ATK for each "Ghostrick" card you control. Once per turn (Quick Effect): You can detach 1 material from this card, then target 1 face-up monster on the field; halve its ATK, until the end of this turn. If this card is sent to the GY: You can target 1 other "Ghostrick" card in your GY; add that target to your hand.
--ゴーストリック・デュラハン
--Ghostrick Dullahan
local s,id=GetID()
function s.initial_effect(c)
	--xyz summon
	Xyz.AddProcedure(c,nil,1,2)
	c:EnableReviveLimit()
	--atk
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e1:SetRange(LOCATION_MZONE)
	e1:SetCode(EFFECT_UPDATE_ATTACK)
	e1:SetValue(s.atkval)
	c:RegisterEffect(e1)
	--atk down
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_ATKCHANGE)
	e2:SetType(EFFECT_TYPE_QUICK_O)
	e2:SetProperty(EFFECT_FLAG_CARD_TARGET+EFFECT_FLAG_DAMAGE_STEP)
	e2:SetCode(EVENT_FREE_CHAIN)
	e2:SetHintTiming(TIMING_DAMAGE_STEP)
	e2:SetRange(LOCATION_MZONE)
	e2:SetCountLimit(1)
	e2:SetCondition(aux.StatChangeDamageStepCondition)
	e2:SetCost(Cost.DetachFromSelf(1))
	e2:SetTarget(s.target)
	e2:SetOperation(s.operation)
	c:RegisterEffect(e2)
	--to hand
	local e3=Effect.CreateEffect(c)
	e3:SetCategory(CATEGORY_TOHAND)
	e3:SetDescription(aux.Stringid(id,1))
	e3:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e3:SetProperty(EFFECT_FLAG_CARD_TARGET+EFFECT_FLAG_DELAY)
	e3:SetCode(EVENT_TO_GRAVE)
	e3:SetTarget(s.thtg)
	e3:SetOperation(s.thop)
	c:RegisterEffect(e3)
end
s.listed_series={SET_GHOSTRICK}
function s.atkfilter(c)
	return c:IsFaceup() and c:IsSetCard(SET_GHOSTRICK)
end
function s.atkval(e,c)
	return Duel.GetMatchingGroupCount(s.atkfilter,c:GetControler(),LOCATION_ONFIELD,0,nil)*200
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsFaceup() and chkc:IsLocation(LOCATION_MZONE) end
	if chk==0 then return Duel.IsExistingTarget(Card.IsFaceup,tp,LOCATION_MZONE,LOCATION_MZONE,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_FACEUP)
	Duel.SelectTarget(tp,Card.IsFaceup,tp,LOCATION_MZONE,LOCATION_MZONE,1,1,nil)
end
function s.operation(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc:IsFaceup() and tc:IsRelateToEffect(e) then
		local e1=Effect.CreateEffect(e:GetHandler())
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_SET_ATTACK_FINAL)
		e1:SetReset(RESETS_STANDARD_PHASE_END)
		e1:SetValue(tc:GetAttack()/2)
		tc:RegisterEffect(e1)
	end
end
function s.filter(c)
	return c:IsSetCard(SET_GHOSTRICK) and c:IsAbleToHand()
end
function s.thtg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_GRAVE) and chkc:IsControler(tp) and s.filter(chkc) end
	if chk==0 then return Duel.IsExistingTarget(s.filter,tp,LOCATION_GRAVE,0,1,e:GetHandler()) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_ATOHAND)
	local g=Duel.SelectTarget(tp,s.filter,tp,LOCATION_GRAVE,0,1,1,e:GetHandler())
	Duel.SetOperationInfo(0,CATEGORY_TOHAND,g,1,0,0)
end
function s.thop(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc:IsRelateToEffect(e) then
		Duel.SendtoHand(tc,nil,REASON_EFFECT)
		Duel.ConfirmCards(1-tp,tc)
	end
end