Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
During the Main Phase (Quick Effect): You can Tribute 1 other Level 7 or higher monster from your hand; Special Summon this card from your hand, also you cannot Special Summon for the rest of this turn, except monsters with a Level. If this card is Special Summoned while you control another "Ursarctic" monster: You can target 1 face-up monster your opponent controls; change it to face-down Defense Position. You can only use each effect of "Ursarctic Megatanus" once per turn.
--ベアルクティ－メガタナス
--Ursarctic Megatanus
--scripted by Rundas
local s,id=GetID()
function s.initial_effect(c)
	--special summon
	c:RegisterEffect(aux.CreateUrsarcticSpsummon(c,id))
	--Change Position
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,1))
	e2:SetCategory(CATEGORY_POSITION)
	e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e2:SetProperty(EFFECT_FLAG_CARD_TARGET+EFFECT_FLAG_DELAY)
	e2:SetCode(EVENT_SPSUMMON_SUCCESS)
	e2:SetCountLimit(1,{id,1})
	e2:SetCondition(s.poscon)
	e2:SetTarget(s.postg)
	e2:SetOperation(s.posop)
	c:RegisterEffect(e2)
end
s.listed_names={id}
s.listed_series={SET_URSARCTIC}
--Change Position
function s.cfilter(c)
	return c:IsFaceup() and c:IsSetCard(SET_URSARCTIC)
end
function s.poscon(e,tp,eg,ep,ev,re,r,rp)
	return Duel.IsExistingMatchingCard(s.cfilter,tp,LOCATION_MZONE,0,1,e:GetHandler())
end
function s.pfilter(c)
	return c:IsFaceup() and c:IsCanTurnSet()
end
function s.postg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return s.pfilter(chkc) and chkc:IsLocation(LOCATION_MZONE) and chkc:IsControler(1-tp) end
	if chk==0 then return Duel.IsExistingTarget(s.pfilter,tp,0,LOCATION_MZONE,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_POSCHANGE)
	local tc=Duel.SelectTarget(tp,s.pfilter,tp,0,LOCATION_MZONE,1,1,nil)
	Duel.SetOperationInfo(0,CATEGORY_POSITION,tc,1,tp,LOCATION_MZONE)
end
function s.posop(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc and tc:IsRelateToEffect(e) then
		Duel.ChangePosition(tc,POS_FACEDOWN_DEFENSE)
	end
end