Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
1 Tuner + 1+ non-Tuner monsters If this card is Special Summoned: You can increase or decrease its Level by 1. If this card is sent to the GY: You can target 1 face-up card your opponent controls; return it to the hand. You can only use this effect of "Golden Cloud Beast - Malong" once per turn.
--金雲獣－馬龍
--Golden Cloud Beast - Malong
--scripted by Naim
local s,id=GetID()
function s.initial_effect(c)
	c:EnableReviveLimit()
	--Synchro Summon procedure
	Synchro.AddProcedure(c,nil,1,1,Synchro.NonTuner(nil),1,99)
	--Increase or Decrease its Level by 1
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_LVCHANGE)
	e1:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e1:SetProperty(EFFECT_FLAG_DELAY)
	e1:SetCode(EVENT_SPSUMMON_SUCCESS)
	e1:SetTarget(s.lvtg)
	e1:SetOperation(s.lvop)
	c:RegisterEffect(e1)
	--Return 1 face-up card your opponent controls to the hand
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,1))
	e2:SetCategory(CATEGORY_TOHAND)
	e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e2:SetProperty(EFFECT_FLAG_CARD_TARGET+EFFECT_FLAG_DELAY)
	e2:SetCode(EVENT_TO_GRAVE)
	e2:SetCountLimit(1,id)
	e2:SetTarget(s.thtg)
	e2:SetOperation(s.thop)
	c:RegisterEffect(e2)
end
function s.lvtg(e,tp,eg,ep,ev,re,r,rp,chk)
	local c=e:GetHandler()
	if chk==0 then return c:HasLevel() end
	Duel.SetOperationInfo(0,CATEGORY_LVCHANGE,c,1,tp,1)
end
function s.lvop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if not (c:IsFaceup() and c:IsRelateToEffect(e) and c:HasLevel()) then return end
	local b1=true
	local b2=c:IsLevelAbove(2)
	local op=Duel.SelectEffect(tp,
		{b1,aux.Stringid(id,2)}, --Increase its Level by 1
		{b2,aux.Stringid(id,3)}) --Decrease its Level by 1
	local value=(op==1 and op) or -1
	---Increase or decrease its Level by 1
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetCode(EFFECT_UPDATE_LEVEL)
	e1:SetValue(value)
	e1:SetReset(RESET_EVENT|RESETS_STANDARD_DISABLE)
	c:RegisterEffect(e1)
end
function s.thtg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsOnField() and chkc:IsControler(1-tp) and chkc:IsFaceup() and chkc:IsAbleToHand() end
	if chk==0 then return Duel.IsExistingTarget(aux.FaceupFilter(Card.IsAbleToHand),tp,0,LOCATION_ONFIELD,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_RTOHAND)
	local g=Duel.SelectTarget(tp,aux.FaceupFilter(Card.IsAbleToHand),tp,0,LOCATION_ONFIELD,1,1,nil)
	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)
	end
end