Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
When this card is activated: Add 1 "Black Luster Soldier" Ritual Monster or 1 "Gaia The Fierce Knight" monster from your Deck to your hand. Each time a Monster Card(s) is sent from the hand or field to the GY, place 1 Spell Counter on this card for each of those cards (max. 6). Once per turn: You can remove 3 Spell Counters from this card; add 1 Ritual Spell from your Deck to your hand. You can only activate 1 "Gateway to Chaos" per turn.
--混沌の場
--Gateway to Chaos
local s,id=GetID()
function s.initial_effect(c)
	c:EnableCounterPermit(COUNTER_SPELL)
	c:SetCounterLimit(COUNTER_SPELL,6)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_TOHAND+CATEGORY_SEARCH)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetCountLimit(1,id,EFFECT_COUNT_CODE_OATH)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
	--add counter
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_CONTINUOUS+EFFECT_TYPE_FIELD)
	e2:SetCode(EVENT_TO_GRAVE)
	e2:SetRange(LOCATION_FZONE)
	e2:SetOperation(s.acop)
	c:RegisterEffect(e2)
	--to hand
	local e3=Effect.CreateEffect(c)
	e3:SetCategory(CATEGORY_TOHAND+CATEGORY_SEARCH)
	e3:SetType(EFFECT_TYPE_IGNITION)
	e3:SetRange(LOCATION_FZONE)
	e3:SetCountLimit(1)
	e3:SetCost(s.thcost)
	e3:SetTarget(s.thtg)
	e3:SetOperation(s.thop)
	c:RegisterEffect(e3)
end
s.listed_series={SET_BLACK_LUSTER_SOLDIER,SET_GAIA_THE_FIERCE_KNIGHT}
s.counter_place_list={COUNTER_SPELL}
function s.filter(c)
	return ((c:IsSetCard(SET_BLACK_LUSTER_SOLDIER) and c:IsType(TYPE_RITUAL)) or c:IsSetCard(SET_GAIA_THE_FIERCE_KNIGHT)) and c:IsMonster() and c:IsAbleToHand()
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.filter,tp,LOCATION_DECK,0,1,nil) end
	Duel.SetOperationInfo(0,CATEGORY_TOHAND,nil,1,tp,LOCATION_DECK)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	if not e:GetHandler():IsRelateToEffect(e) then return end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_ATOHAND)
	local g=Duel.SelectMatchingCard(tp,s.filter,tp,LOCATION_DECK,0,1,1,nil)
	if #g>0 then
		Duel.SendtoHand(g,nil,REASON_EFFECT)
		Duel.ConfirmCards(1-tp,g)
	end
end
function s.cfilter(c)
	return c:IsMonster() and c:IsPreviousLocation(LOCATION_HAND|LOCATION_ONFIELD)
end
function s.acop(e,tp,eg,ep,ev,re,r,rp)
	local ct=eg:FilterCount(s.cfilter,nil)
	if ct>0 then
		e:GetHandler():AddCounter(COUNTER_SPELL,ct,true)
	end
end
function s.thcost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return e:GetHandler():IsCanRemoveCounter(tp,COUNTER_SPELL,3,REASON_COST) end
	e:GetHandler():RemoveCounter(tp,COUNTER_SPELL,3,REASON_COST)
end
function s.thfilter(c)
	return c:IsRitualSpell() and c:IsAbleToHand()
end
function s.thtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.thfilter,tp,LOCATION_DECK,0,1,nil) end
	Duel.SetOperationInfo(0,CATEGORY_TOHAND,nil,1,tp,LOCATION_DECK)
end
function s.thop(e,tp,eg,ep,ev,re,r,rp)
	if not e:GetHandler():IsRelateToEffect(e) then return end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_ATOHAND)
	local g=Duel.SelectMatchingCard(tp,s.thfilter,tp,LOCATION_DECK,0,1,1,nil)
	if #g>0 then
		Duel.SendtoHand(g,nil,REASON_EFFECT)
		Duel.ConfirmCards(1-tp,g)
	end
end