Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
You can Special Summon this card (from your hand) by Tributing 1 "Helios Duo Megistus". This card's ATK/DEF become the number of banished monsters x 300. After this card attacks, if your opponent controls a monster, this card can make a second attack in a row. During the End Phase, if this card is in the GY because it was destroyed by battle and sent there this turn: You can Special Summon this card, and it gains 500 ATK/DEF.
--ヘリオス・トリス・メギストス
--Helios Trice Megistus
local s,id=GetID()
function s.initial_effect(c)
	--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.hspcon)
	e1:SetTarget(s.hsptg)
	e1:SetOperation(s.hspop)
	c:RegisterEffect(e1)
	--atk/def
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_SINGLE)
	e2:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e2:SetRange(LOCATION_MZONE)
	e2:SetCode(EFFECT_SET_ATTACK)
	e2:SetValue(s.value)
	c:RegisterEffect(e2)
	local e3=e2:Clone()
	e3:SetCode(EFFECT_SET_DEFENSE)
	c:RegisterEffect(e3)
	--spsummon
	local e4=Effect.CreateEffect(c)
	e4:SetDescription(aux.Stringid(id,0))
	e4:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e4:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_F)
	e4:SetCode(EVENT_PHASE+PHASE_END)
	e4:SetRange(LOCATION_GRAVE)
	e4:SetCountLimit(1)
	e4:SetCondition(s.spcon)
	e4:SetTarget(s.sptg)
	e4:SetOperation(s.spop)
	c:RegisterEffect(e4)
	--chain attack
	local e5=Effect.CreateEffect(c)
	e5:SetType(EFFECT_TYPE_SINGLE)
	e5:SetCode(EFFECT_EXTRA_ATTACK)
	e5:SetValue(1)
	e5:SetCondition(s.atcon)
	c:RegisterEffect(e5)
end
s.listed_names={80887952}
function s.hspcon(e,c)
	if c==nil then return true end
	return Duel.CheckReleaseGroup(c:GetControler(),Card.IsCode,1,false,1,true,c,c:GetControler(),nil,false,nil,80887952)
end
function s.hsptg(e,tp,eg,ep,ev,re,r,rp,c)
	local g=Duel.SelectReleaseGroup(tp,Card.IsCode,1,1,false,true,true,c,nil,nil,false,nil,80887952)
	if g then
		g:KeepAlive()
		e:SetLabelObject(g)
	return true
	end
	return false
end
function s.hspop(e,tp,eg,ep,ev,re,r,rp,c)
	local g=e:GetLabelObject()
	if not g then return end
	Duel.Release(g,REASON_COST)
	g:DeleteGroup()
end
function s.value(e,c)
	return Duel.GetMatchingGroupCount(aux.FaceupFilter(Card.IsMonster),0,LOCATION_REMOVED,LOCATION_REMOVED,nil)*300
end
function s.spcon(e,tp,eg,ep,ev,re,r,rp)
	return e:GetHandler():IsReason(REASON_BATTLE) and e:GetHandler():GetTurnID()==Duel.GetTurnCount()
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 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) and Duel.SpecialSummonStep(c,0,tp,tp,false,false,POS_FACEUP) then
		local e1=Effect.CreateEffect(c)
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
		e1:SetRange(LOCATION_MZONE)
		e1:SetCode(EFFECT_UPDATE_ATTACK)
		e1:SetValue(500)
		e1:SetReset(RESET_EVENT|RESETS_STANDARD)
		c:RegisterEffect(e1)
		local e2=e1:Clone()
		e2:SetCode(EFFECT_UPDATE_DEFENSE)
		c:RegisterEffect(e2)
	end
	Duel.SpecialSummonComplete()
end
function s.atcon(e)
	return Duel.GetFieldGroupCount(e:GetHandlerPlayer(),0,LOCATION_MZONE)>0
end