Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Cannot be Normal Summoned/Set. Must first be Special Summoned (from your hand) by controlling 3 or more "Meklord" monsters. When this card is Special Summoned: You can target any number of "Meklord" monsters you control, except this card; send those targets to the GY, and if you do, this card's ATK becomes the combined original ATK of the monsters sent to the GY by this effect. Each time a Synchro Monster(s) is Special Summoned: Inflict 1000 damage to the Summoning player.
--機皇神龍アステリスク
--Meklord Astro Dragon Asterisk
local s,id=GetID()
function s.initial_effect(c)
	c:EnableReviveLimit()
	--special summon
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetCode(EFFECT_SPSUMMON_PROC)
	e1:SetProperty(EFFECT_FLAG_UNCOPYABLE)
	e1:SetRange(LOCATION_HAND)
	e1:SetCondition(s.spcon)
	c:RegisterEffect(e1)
	--atkup
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_ATKCHANGE+CATEGORY_TOGRAVE)
	e2:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e2:SetCode(EVENT_SPSUMMON_SUCCESS)
	e2:SetTarget(s.atktg)
	e2:SetOperation(s.atkop)
	c:RegisterEffect(e2)
	--damage
	local e3=Effect.CreateEffect(c)
	e3:SetDescription(aux.Stringid(id,1))
	e3:SetCategory(CATEGORY_DAMAGE)
	e3:SetType(EFFECT_TYPE_TRIGGER_F+EFFECT_TYPE_FIELD)
	e3:SetCode(EVENT_SPSUMMON_SUCCESS)
	e3:SetRange(LOCATION_MZONE)
	e3:SetCondition(s.damcon)
	e3:SetTarget(s.damtg)
	e3:SetOperation(s.damop)
	c:RegisterEffect(e3)
end
s.listed_series={SET_MEKLORD}
function s.spfilter(c)
	return c:IsFaceup() and c:IsSetCard(SET_MEKLORD)
end
function s.spcon(e,c)
	if c==nil then return true end
	return Duel.GetLocationCount(c:GetControler(),LOCATION_MZONE)>0
		and Duel.IsExistingMatchingCard(s.spfilter,c:GetControler(),LOCATION_MZONE,0,3,nil)
end
function s.atktg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chk==0 then return Duel.IsExistingTarget(s.spfilter,tp,LOCATION_MZONE,0,1,e:GetHandler()) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_TOGRAVE)
	local g=Duel.SelectTarget(tp,s.spfilter,tp,LOCATION_MZONE,0,1,5,e:GetHandler())
	Duel.SetOperationInfo(0,CATEGORY_TOGRAVE,g,#g,0,0)
end
function s.atkfilter(c,e)
	return c:IsRelateToEffect(e) and c:IsFaceup()
end
function s.atkop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	local g=Duel.GetChainInfo(0,CHAININFO_TARGET_CARDS):Filter(s.atkfilter,nil,e)
	Duel.SendtoGrave(g,REASON_EFFECT)
	local ct=Duel.GetOperatedGroup():Filter(Card.IsLocation,nil,LOCATION_GRAVE)
	if #ct>0 then
		if not c:IsRelateToEffect(e) or c:IsFacedown() then return end
		local atk=0
		for tc in aux.Next(ct) do
			local oatk=math.max(tc:GetTextAttack(),0)
			atk=atk+oatk
		end
		local e1=Effect.CreateEffect(c)
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_SET_ATTACK_FINAL)
		e1:SetValue(atk)
		e1:SetReset(RESET_EVENT|RESETS_STANDARD_DISABLE)
		c:RegisterEffect(e1)
	end
end
function s.damcon(e,tp,eg,ep,ev,re,r,rp)
	return eg:IsExists(Card.IsType,1,nil,TYPE_SYNCHRO)
end
function s.damtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	local t1=false
	local t2=false
	local tc=eg:GetFirst()
	for tc in aux.Next(eg) do
		if tc:IsType(TYPE_SYNCHRO) then
			if tc:IsSummonPlayer(tp) then t1=true else t2=true end
		end
	end
	if t1 and not t2 then Duel.SetOperationInfo(0,CATEGORY_DAMAGE,nil,0,tp,1000)
	elseif not t1 and t2 then Duel.SetOperationInfo(0,CATEGORY_DAMAGE,nil,0,1-tp,1000)
	else Duel.SetOperationInfo(0,CATEGORY_DAMAGE,nil,0,PLAYER_ALL,1000) end
end
function s.damop(e,tp,eg,ep,ev,re,r,rp)
	local ex,g,gc,dp,dv=Duel.GetOperationInfo(0,CATEGORY_DAMAGE)
	if dp~=PLAYER_ALL then Duel.Damage(dp,1000,REASON_EFFECT)
	else
		Duel.Damage(tp,1000,REASON_EFFECT,true)
		Duel.Damage(1-tp,1000,REASON_EFFECT,true)
		Duel.RDComplete()
	end
end