Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Equip only to a "Qli" monster. It gains 300 ATK and cannot be destroyed by battle. The equipped monster can be treated as 2 Tributes for the Tribute Summon of a "Qli" monster. If this card is sent from the field to the Graveyard: You can add 1 "Qli" monster from your Deck to your hand.
--機殻の生贄
--Saqlifice
local s,id=GetID()
function s.initial_effect(c)
	aux.AddEquipProcedure(c,nil,aux.FilterBoolFunction(Card.IsSetCard,SET_QLI))
	--Atk up
	local e3=Effect.CreateEffect(c)
	e3:SetType(EFFECT_TYPE_EQUIP)
	e3:SetCode(EFFECT_UPDATE_ATTACK)
	e3:SetValue(300)
	c:RegisterEffect(e3)
	--battle indestructable
	local e4=Effect.CreateEffect(c)
	e4:SetType(EFFECT_TYPE_EQUIP)
	e4:SetCode(EFFECT_INDESTRUCTABLE_BATTLE)
	e4:SetValue(1)
	c:RegisterEffect(e4)
	--double tribute
	local e5=Effect.CreateEffect(c)
	e5:SetType(EFFECT_TYPE_EQUIP)
	e5:SetCode(EFFECT_DOUBLE_TRIBUTE)
	e5:SetValue(s.effcon)
	c:RegisterEffect(e5)
	--search
	local e6=Effect.CreateEffect(c)
	e6:SetDescription(aux.Stringid(id,0))
	e6:SetCategory(CATEGORY_TOHAND+CATEGORY_SEARCH)
	e6:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e6:SetCode(EVENT_TO_GRAVE)
	e6:SetProperty(EFFECT_FLAG_DAMAGE_STEP+EFFECT_FLAG_DELAY)
	e6:SetCondition(s.thcon)
	e6:SetTarget(s.thtg)
	e6:SetOperation(s.thop)
	c:RegisterEffect(e6)
end
s.listed_series={SET_QLI}
function s.effcon(e,c)
	return c:IsSetCard(SET_QLI)
end
function s.thcon(e,tp,eg,ep,ev,re,r,rp)
	return e:GetHandler():IsPreviousLocation(LOCATION_ONFIELD)
end
function s.thfilter(c)
	return c:IsSetCard(SET_QLI) and c:IsMonster() 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)
	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