Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
1 Tuner + 1+ non-Tuner monsters If this card is Synchro Summoned: You can return all Rank 4 Xyz Monsters on the field to the Extra Deck. If you Fusion Summon using this card as Fusion Material: Draw 1 card. An Xyz Monster that was Summoned using this card on the field as Xyz Material gains this effect. ● If it is Xyz Summoned: Draw 1 card.
--古神クトグア
--Old Entity Cthugua
local s,id=GetID()
function s.initial_effect(c)
	--synchro summon
	Synchro.AddProcedure(c,nil,1,1,Synchro.NonTuner(nil),1,99)
	c:EnableReviveLimit()
	--special summon
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_TODECK)
	e1:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e1:SetProperty(EFFECT_FLAG_DELAY)
	e1:SetCode(EVENT_SPSUMMON_SUCCESS)
	e1:SetCondition(s.tdcon)
	e1:SetTarget(s.tdtg)
	e1:SetOperation(s.tdop)
	c:RegisterEffect(e1)
	--draw
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,1))
	e2:SetCategory(CATEGORY_DRAW)
	e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_F)
	e2:SetCode(EVENT_BE_MATERIAL)
	e2:SetProperty(EFFECT_FLAG_PLAYER_TARGET)
	e2:SetCondition(s.drcon)
	e2:SetTarget(s.drtg)
	e2:SetOperation(s.drop)
	c:RegisterEffect(e2)
	--effect gain
	local e3=Effect.CreateEffect(c)
	e3:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_CONTINUOUS)
	e3:SetCode(EVENT_BE_MATERIAL)
	e3:SetCondition(s.efcon)
	e3:SetOperation(s.efop)
	c:RegisterEffect(e3)
end
function s.tdcon(e,tp,eg,ep,ev,re,r,rp)
	return e:GetHandler():IsSynchroSummoned()
end
function s.filter(c)
	return c:IsType(TYPE_XYZ) and c:GetRank()==4 and c:IsAbleToExtra()
end
function s.tdtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.filter,tp,LOCATION_MZONE,LOCATION_MZONE,1,nil) end
	local g=Duel.GetMatchingGroup(s.filter,tp,LOCATION_MZONE,LOCATION_MZONE,nil)
	Duel.SetOperationInfo(0,CATEGORY_TODECK,g,#g,0,0)
end
function s.tdop(e,tp,eg,ep,ev,re,r,rp)
	local g=Duel.GetMatchingGroup(s.filter,tp,LOCATION_MZONE,LOCATION_MZONE,nil)
	if #g>0 then
		Duel.SendtoDeck(g,nil,SEQ_DECKTOP,REASON_EFFECT)
	end
end
function s.drcon(e,tp,eg,ep,ev,re,r,rp)
	return r==REASON_FUSION
end
function s.drtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetTargetPlayer(tp)
	Duel.SetTargetParam(1)
	Duel.SetOperationInfo(0,CATEGORY_DRAW,nil,0,tp,1)
end
function s.drop(e,tp,eg,ep,ev,re,r,rp)
	local p,d=Duel.GetChainInfo(0,CHAININFO_TARGET_PLAYER,CHAININFO_TARGET_PARAM)
	Duel.Draw(p,d,REASON_EFFECT)
end
function s.efcon(e,tp,eg,ep,ev,re,r,rp)
	return r==REASON_XYZ
end
function s.efop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	local rc=c:GetReasonCard()
	local e1=Effect.CreateEffect(rc)
	e1:SetDescription(aux.Stringid(id,2))
	e1:SetCategory(CATEGORY_DRAW)
	e1:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_F)
	e1:SetProperty(EFFECT_FLAG_PLAYER_TARGET)
	e1:SetCode(EVENT_SPSUMMON_SUCCESS)
	e1:SetCondition(s.drcon2)
	e1:SetTarget(s.drtg)
	e1:SetOperation(s.drop)
	e1:SetReset(RESET_EVENT|RESETS_STANDARD)
	rc:RegisterEffect(e1,true)
	if not rc:IsType(TYPE_EFFECT) then
		local e2=Effect.CreateEffect(c)
		e2:SetType(EFFECT_TYPE_SINGLE)
		e2:SetCode(EFFECT_ADD_TYPE)
		e2:SetValue(TYPE_EFFECT)
		e2:SetReset(RESET_EVENT|RESETS_STANDARD)
		rc:RegisterEffect(e2,true)
	end
end
function s.drcon2(e,tp,eg,ep,ev,re,r,rp)
	return e:GetHandler():IsXyzSummoned()
end