Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
You can discard 1 "Harpie" card; Special Summon 1 "Harpie" monster from your Deck in Defense Position, except "Harpie Channeler". You can only use this effect of "Harpie Channeler" once per turn. While you control a Dragon monster, this card's Level becomes 7. This card's name becomes "Harpie Lady" while on the field or in the GY.
--ハーピィ・チャネラー
--Harpie Channeler
local s,id=GetID()
function s.initial_effect(c)
	--special summon
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e1:SetType(EFFECT_TYPE_IGNITION)
	e1:SetCountLimit(1,id)
	e1:SetRange(LOCATION_MZONE)
	e1:SetCost(s.spcost)
	e1:SetTarget(s.sptg)
	e1:SetOperation(s.spop)
	c:RegisterEffect(e1)
	--change name
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_SINGLE)
	e2:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e2:SetCode(EFFECT_CHANGE_CODE)
	e2:SetRange(LOCATION_MZONE|LOCATION_GRAVE)
	e2:SetValue(CARD_HARPIE_LADY)
	c:RegisterEffect(e2)
	--change level
	local e3=Effect.CreateEffect(c)
	e3:SetType(EFFECT_TYPE_SINGLE)
	e3:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e3:SetCode(EFFECT_CHANGE_LEVEL)
	e3:SetRange(LOCATION_MZONE)
	e3:SetCondition(s.lvcon)
	e3:SetValue(7)
	c:RegisterEffect(e3)
end
s.listed_series={SET_HARPIE}
s.listed_names={CARD_HARPIE_LADY}
function s.cfilter(c)
	return c:IsSetCard(SET_HARPIE) and c:IsDiscardable()
end
function s.spcost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.cfilter,tp,LOCATION_HAND,0,1,e:GetHandler()) end
	Duel.DiscardHand(tp,s.cfilter,1,1,REASON_COST|REASON_DISCARD)
end
function s.filter(c,e,tp)
	return c:IsSetCard(SET_HARPIE) and c:GetCode()~=id and c:IsCanBeSpecialSummoned(e,0,tp,false,false,POS_FACEUP_DEFENSE)
end
function s.sptg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.GetLocationCount(tp,LOCATION_MZONE)>0
		and Duel.IsExistingMatchingCard(s.filter,tp,LOCATION_DECK,0,1,nil,e,tp) end
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,1,tp,LOCATION_DECK)
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	if Duel.GetLocationCount(tp,LOCATION_MZONE)<=0 then return end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
	local g=Duel.SelectMatchingCard(tp,s.filter,tp,LOCATION_DECK,0,1,1,nil,e,tp)
	if #g>0 then
		Duel.SpecialSummon(g,0,tp,tp,false,false,POS_FACEUP_DEFENSE)
	end
end
function s.lvcon(e)
	return Duel.IsExistingMatchingCard(aux.FaceupFilter(Card.IsRace,RACE_DRAGON),e:GetHandlerPlayer(),LOCATION_MZONE,0,1,nil)
end