Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Increase this card's Level by 4 during your opponent's turn only. When this card destroys an opponent's monster by battle and sends it to the GY: You can send 1 Level 7 or 8 Dragon monster from your Deck to the GY. You can send 1 card from your hand to the GY, then target 1 Level 7 or 8 Dragon monster in your GY; send this card to the GY, and if you do, Special Summon that monster. You can only use this effect of "Dragon Knight of Creation" once per turn.
--創世の竜騎士
--Dragon Knight of Creation
local s,id=GetID()
function s.initial_effect(c)
	--level
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetCode(EFFECT_UPDATE_LEVEL)
	e1:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e1:SetRange(LOCATION_MZONE)
	e1:SetValue(4)
	e1:SetCondition(s.lvcon)
	c:RegisterEffect(e1)
	--to grave
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_TOGRAVE)
	e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e2:SetCode(EVENT_BATTLE_DESTROYING)
	e2:SetCondition(aux.bdogcon)
	e2:SetTarget(s.tgtg)
	e2:SetOperation(s.tgop)
	c:RegisterEffect(e2)
	--special summon
	local e3=Effect.CreateEffect(c)
	e3:SetDescription(aux.Stringid(id,1))
	e3:SetCategory(CATEGORY_TOGRAVE+CATEGORY_SPECIAL_SUMMON)
	e3:SetType(EFFECT_TYPE_IGNITION)
	e3:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e3:SetRange(LOCATION_MZONE)
	e3:SetCountLimit(1,id)
	e3:SetCost(s.spcost)
	e3:SetTarget(s.sptg)
	e3:SetOperation(s.spop)
	c:RegisterEffect(e3)
end
function s.lvcon(e)
	return Duel.GetTurnPlayer()~=e:GetHandlerPlayer()
end
function s.tgfilter(c)
	local lv=c:GetLevel()
	return c:IsRace(RACE_DRAGON) and (lv==7 or lv==8) and c:IsAbleToGrave()
end
function s.tgtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.tgfilter,tp,LOCATION_DECK,0,1,nil) end
	Duel.SetOperationInfo(0,CATEGORY_TOGRAVE,nil,1,tp,LOCATION_DECK)
end
function s.tgop(e,tp,eg,ep,ev,re,r,rp)
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_TOGRAVE)
	local g=Duel.SelectMatchingCard(tp,s.tgfilter,tp,LOCATION_DECK,0,1,1,nil)
	if #g>0 then
		Duel.SendtoGrave(g,REASON_EFFECT)
	end
end
function s.spcost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(Card.IsAbleToGraveAsCost,tp,LOCATION_HAND,0,1,nil) end
	Duel.DiscardHand(tp,Card.IsAbleToGraveAsCost,1,1,REASON_COST)
end
function s.spfilter(c,e,tp)
	local lv=c:GetLevel()
	return c:IsRace(RACE_DRAGON) and (lv==7 or lv==8) and c:IsCanBeSpecialSummoned(e,0,tp,false,false)
end
function s.sptg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsControler(tp) and chkc:IsLocation(LOCATION_GRAVE) and s.spfilter(chkc,e,tp) end
	if chk==0 then return Duel.GetLocationCount(tp,LOCATION_MZONE)>-1 and e:GetHandler():IsAbleToGrave()
		and Duel.IsExistingTarget(s.spfilter,tp,LOCATION_GRAVE,0,1,nil,e,tp) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
	local g=Duel.SelectTarget(tp,s.spfilter,tp,LOCATION_GRAVE,0,1,1,nil,e,tp)
	Duel.SetOperationInfo(0,CATEGORY_TOGRAVE,e:GetHandler(),1,0,0)
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,g,1,0,0)
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if c:IsRelateToEffect(e) and Duel.SendtoGrave(c,REASON_EFFECT)~=0 and c:IsLocation(LOCATION_GRAVE) then
		local tc=Duel.GetFirstTarget()
		if tc:IsRelateToEffect(e) then
			Duel.SpecialSummon(tc,0,tp,tp,false,false,POS_FACEUP)
		end
	end
end