Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Cannot be Synchro Summoned. Must be Special Summoned (from your Extra Deck) by sending 2 monsters you control with a Level difference of 1 to the GY (1 Tuner and 1 non-Tuner). If this card is Special Summoned: You can activate 1 "Ursarctic Big Dipper" directly from your Deck. You can Tribute 1 Level 7 or higher monster; add to your hand, or Special Summon, 1 "Ursarctic" monster from your GY. You can only use each effect of "Ursarctic Polari" once per turn.
--ベアルクティ－ポラリィ
--Ursarctic Polari
local s,id=GetID()
function s.initial_effect(c)
	c:EnableReviveLimit()
	c:AddMustBeSpecialSummoned()
	--Must be Special Summoned (from your Extra Deck) by sending 2 monsters you control with a Level difference of 1 to the GY (1 Tuner and 1 non-Tuner)
	local e0=Effect.CreateEffect(c)
	e0:SetType(EFFECT_TYPE_FIELD)
	e0:SetProperty(EFFECT_FLAG_CANNOT_DISABLE+EFFECT_FLAG_UNCOPYABLE)
	e0:SetCode(EFFECT_SPSUMMON_PROC)
	e0:SetRange(LOCATION_EXTRA)
	e0:SetCondition(s.sprcon)
	e0:SetTarget(s.sprtg)
	e0:SetOperation(s.sprop)
	c:RegisterEffect(e0)
	--Activate 1 "Ursarctic Big Dipper" from your Deck
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e1:SetProperty(EFFECT_FLAG_DELAY)
	e1:SetCode(EVENT_SPSUMMON_SUCCESS)
	e1:SetCountLimit(1,id)
	e1:SetTarget(s.acttg)
	e1:SetOperation(s.actop)
	c:RegisterEffect(e1)
	--Add to your hand, or Special Summon, 1 "Ursarctic" monster from your GY
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,1))
	e2:SetCategory(CATEGORY_TOHAND+CATEGORY_SPECIAL_SUMMON)
	e2:SetType(EFFECT_TYPE_IGNITION)
	e2:SetRange(LOCATION_MZONE)
	e2:SetCountLimit(1,{id,1})
	e2:SetCost(aux.CostWithReplace(s.thspcost,CARD_URSARCTIC_BIG_DIPPER,s.extracon))
	e2:SetTarget(s.thsptg)
	e2:SetOperation(s.thspop)
	c:RegisterEffect(e2)
end
s.listed_series={SET_URSARCTIC}
s.listed_names={CARD_URSARCTIC_BIG_DIPPER}
function s.sprfilter(c)
	return c:IsFaceup() and c:IsAbleToGraveAsCost() and c:HasLevel()
end
function s.sprfilter1(c,tp,g,sc)
	local g=Duel.GetMatchingGroup(s.sprfilter,tp,LOCATION_MZONE,0,nil)
	return c:IsType(TYPE_TUNER) and g:IsExists(s.sprfilter2,1,c,tp,c,sc)
end
function s.sprfilter2(c,tp,mc,sc)
	local sg=Group.FromCards(c,mc)
	return (math.abs((c:GetLevel()-mc:GetLevel()))==1) and not c:IsType(TYPE_TUNER) and Duel.GetLocationCountFromEx(tp,tp,sg,sc)>0
end
function s.sprcon(e,c)
	if c==nil then return true end
	local tp=c:GetControler()
	local g=Duel.GetMatchingGroup(s.sprfilter,tp,LOCATION_MZONE,0,nil)
	return g:IsExists(s.sprfilter1,1,nil,tp,g,c)
end
function s.sprtg(e,tp,eg,ep,ev,re,r,rp,chk,c)
	local g=Duel.GetMatchingGroup(s.sprfilter,tp,LOCATION_MZONE,0,nil)
	local g1=g:Filter(s.sprfilter1,nil,tp,g,c)
	local mg1=aux.SelectUnselectGroup(g1,e,tp,1,1,nil,1,tp,HINTMSG_TOGRAVE,nil,nil,true)
	if #mg1>0 then
		local mc=mg1:GetFirst()
		local g2=g:Filter(s.sprfilter2,mc,tp,mc,c,mc:GetLevel())
		local mg2=aux.SelectUnselectGroup(g2,e,tp,1,1,nil,1,tp,HINTMSG_TOGRAVE,nil,nil,true)
		mg1:Merge(mg2)
	end
	if #mg1==2 then
		mg1:KeepAlive()
		e:SetLabelObject(mg1)
		return true
	end
	return false
end
function s.sprop(e,tp,eg,ep,ev,re,r,rp,c)
	local g=e:GetLabelObject()
	if not g then return end
	Duel.SendtoGrave(g,REASON_COST)
end
function s.actfilter(c,tp)
	return c:IsCode(CARD_URSARCTIC_BIG_DIPPER) and c:GetActivateEffect() and c:GetActivateEffect():IsActivatable(tp,true,true)
end
function s.acttg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.actfilter,tp,LOCATION_DECK,0,1,nil,tp) end
end
function s.actop(e,tp,eg,ep,ev,re,r,rp)
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_TOFIELD)
	local sc=Duel.SelectMatchingCard(tp,s.actfilter,tp,LOCATION_DECK,0,1,1,nil,tp):GetFirst()
	if sc then
		Duel.ActivateFieldSpell(sc,e,tp,eg,ep,ev,re,r,rp)
	end
end
function s.thspcostfilter(c,e,tp)
	return c:IsLevelAbove(7) and Duel.IsExistingMatchingCard(s.thspfilter,tp,LOCATION_GRAVE,0,1,nil,e,tp,Duel.GetMZoneCount(tp,c)>0)
end
function s.thspfilter(c,e,tp,mmz_chk)
	return (c:IsSetCard(SET_URSARCTIC) and c:IsMonster()) and (c:IsAbleToHand() or (mmz_chk and c:IsCanBeSpecialSummoned(e,0,tp,false,false)))
end
function s.thspcost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.CheckReleaseGroupCost(tp,s.thspcostfilter,1,false,nil,nil,e,tp) end
	local g=Duel.SelectReleaseGroupCost(tp,s.thspcostfilter,1,1,false,nil,nil,e,tp)
	Duel.Release(g,REASON_COST)
end
function s.thsptg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetOperationInfo(0,CATEGORY_LEAVE_GRAVE,nil,1,tp,0)
	Duel.SetPossibleOperationInfo(0,CATEGORY_TOHAND,nil,1,tp,LOCATION_GRAVE)
	Duel.SetPossibleOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,1,tp,LOCATION_GRAVE)
end
function s.thspop(e,tp,eg,ep,ev,re,r,rp)
	local mmz_chk=Duel.GetLocationCount(tp,LOCATION_MZONE)>0
	Duel.Hint(HINT_SELECTMSG,tp,aux.Stringid(id,2))
	local sc=Duel.SelectMatchingCard(tp,s.thspfilter,tp,LOCATION_GRAVE,0,1,1,nil,e,tp,mmz_chk):GetFirst()
	if not sc then return end
	aux.ToHandOrElse(sc,tp,
		function()
			return mmz_chk and sc:IsCanBeSpecialSummoned(e,0,tp,false,false)
		end,
		function()
			Duel.SpecialSummon(sc,0,tp,tp,false,false,POS_FACEUP)
		end,
		aux.Stringid(id,3)
	)
end
function s.extracon(base,e,tp,eg,ep,ev,re,r,rp,c)
	return Duel.IsExistingMatchingCard(s.thspfilter,tp,LOCATION_GRAVE,0,1,c,e,tp,Duel.GetLocationCount(tp,LOCATION_MZONE)>0)
end