Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
All monsters your opponent controls lose 500 ATK/DEF for each Dragon monster you control. You can only use each of the following effects of "World Legacy Guardragon Mardark" once per turn. ● You can banish 2 Normal Monsters from your hand or GY; Special Summon this card from your hand. ● If this card on the field is destroyed by battle or card effect: You can add, from your GY to your hand, 1 Level 9 monster with a different original Type and Attribute than this card.
--星遺物の守護竜メロダーク
--World Legacy Guardragon Mardark
--Scripted by Eerie Code
local s,id=GetID()
function s.initial_effect(c)
	--spsummon
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e1:SetType(EFFECT_TYPE_IGNITION)
	e1:SetRange(LOCATION_HAND)
	e1:SetCountLimit(1,id)
	e1:SetCost(s.spcost)
	e1:SetTarget(s.sptg)
	e1:SetOperation(s.spop)
	c:RegisterEffect(e1)
	--atk down
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_FIELD)
	e2:SetCode(EFFECT_UPDATE_ATTACK)
	e2:SetRange(LOCATION_MZONE)
	e2:SetTargetRange(0,LOCATION_MZONE)
	e2:SetValue(s.atkval)
	c:RegisterEffect(e2)
	local e3=e2:Clone()
	e3:SetCode(EFFECT_UPDATE_DEFENSE)
	c:RegisterEffect(e3)
	--to hand
	local e3=Effect.CreateEffect(c)
	e3:SetCategory(CATEGORY_TOHAND)
	e3:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e3:SetProperty(EFFECT_FLAG_DAMAGE_STEP+EFFECT_FLAG_DELAY)
	e3:SetCountLimit(1,{id,1})
	e3:SetCode(EVENT_DESTROYED)
	e3:SetCondition(s.thcon)
	e3:SetTarget(s.thtg)
	e3:SetOperation(s.thop)
	c:RegisterEffect(e3)
end
function s.spfilter(c)
	return c:IsType(TYPE_NORMAL) and c:IsAbleToRemoveAsCost() and (c:IsLocation(LOCATION_HAND) or aux.SpElimFilter(c,true))
end
function s.spcost(e,tp,eg,ep,ev,re,r,rp,chk)
	local rg=Duel.GetMatchingGroup(s.spfilter,tp,LOCATION_HAND|LOCATION_MZONE|LOCATION_GRAVE,0,e:GetHandler())
	if chk==0 then return Duel.GetLocationCount(tp,LOCATION_MZONE)>-2 and #rg>1 
		and aux.SelectUnselectGroup(rg,e,tp,2,2,aux.ChkfMMZ(1),0) end
	local g=aux.SelectUnselectGroup(rg,e,tp,2,2,aux.ChkfMMZ(1),1,tp,HINTMSG_REMOVE)
	Duel.Remove(g,POS_FACEUP,REASON_COST)
end
function s.sptg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return e:GetHandler():IsCanBeSpecialSummoned(e,0,tp,false,false) end
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,e:GetHandler(),1,0,0)
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if c:IsRelateToEffect(e) then 
		Duel.SpecialSummon(c,0,tp,tp,false,false,POS_FACEUP)
	end
end
function s.atkval(e,c)
	return Duel.GetMatchingGroupCount(aux.FaceupFilter(Card.IsRace,RACE_DRAGON),e:GetHandlerPlayer(),LOCATION_MZONE,0,nil)*-500
end
function s.thcon(e,tp,eg,ep,ev,re,r,rp)
	return (r&REASON_EFFECT+REASON_BATTLE)~=0 and e:GetHandler():IsPreviousLocation(LOCATION_ONFIELD)
end
function s.thfilter(c,ec)
	return c:IsLevel(9) and c:IsAbleToHand()
		and c:GetOriginalAttribute()~=ec:GetOriginalAttribute()
		and c:GetOriginalRace()~=ec:GetOriginalRace()
end
function s.thtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.thfilter,tp,LOCATION_GRAVE,0,1,nil,e:GetHandler()) end
	Duel.SetOperationInfo(0,CATEGORY_TOHAND,nil,1,tp,LOCATION_GRAVE)
end
function s.thop(e,tp,eg,ep,ev,re,r,rp)
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_ATOHAND)
	local g=Duel.SelectMatchingCard(tp,aux.NecroValleyFilter(s.thfilter),tp,LOCATION_GRAVE,0,1,1,nil,e:GetHandler())
	if #g>0 then
		Duel.SendtoHand(g,nil,REASON_EFFECT)
		Duel.ConfirmCards(1-tp,g)
	end
end