Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If you control no monsters, you can Normal Summon this card without Tributing. When this card is Normal Summoned: You can banish 1 monster your opponent controls with equal or higher ATK than this card. You can discard 1 card; add 1 of the following monsters from your Deck to your hand. ● Level 7 DARK Dragon ● Level 6 DARK Machine ● Level 5 WATER Warrior You can only use this effect of "Giltia the D. Knight - Soul Spear" once per turn.
--魔導騎士ギルティア－ソウル・スピア
--Giltia the D. Knight - Soul Spear
--Scripted by Eerie Code
local s,id=GetID()
function s.initial_effect(c)
	--summon with no tribute
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetProperty(EFFECT_FLAG_UNCOPYABLE)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetCode(EFFECT_SUMMON_PROC)
	e1:SetCondition(s.ntcon)
	c:RegisterEffect(e1)
	--banish
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,1))
	e2:SetCategory(CATEGORY_REMOVE)
	e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e2:SetCode(EVENT_SUMMON_SUCCESS)
	e2:SetTarget(s.rmtg)
	e2:SetOperation(s.rmop)
	c:RegisterEffect(e2)
	--search
	local e3=Effect.CreateEffect(c)
	e3:SetDescription(aux.Stringid(id,2))
	e3:SetCategory(CATEGORY_TOHAND+CATEGORY_SEARCH)
	e3:SetType(EFFECT_TYPE_IGNITION)
	e3:SetRange(LOCATION_MZONE)
	e3:SetCountLimit(1,id)
	e3:SetCost(s.thcost)
	e3:SetTarget(s.thtg)
	e3:SetOperation(s.thop)
	c:RegisterEffect(e3)
end
function s.ntcon(e,c,minc)
	if c==nil then return true end
	return minc==0 and c:IsLevelAbove(5) and Duel.GetLocationCount(c:GetControler(),LOCATION_MZONE)>0
		and Duel.GetFieldGroupCount(c:GetControler(),LOCATION_MZONE,0)==0
end
function s.rmfilter(c,atk)
	return c:IsFaceup() and c:IsAttackAbove(atk) and c:IsAbleToRemove()
end
function s.rmtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.rmfilter,tp,0,LOCATION_MZONE,1,nil,e:GetHandler():GetAttack()) end
	Duel.SetOperationInfo(0,CATEGORY_REMOVE,nil,1,1-tp,LOCATION_MZONE)
end
function s.rmop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if not c:IsRelateToEffect(e) or c:IsFacedown() then return end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_REMOVE)
	local g=Duel.SelectMatchingCard(tp,s.rmfilter,tp,0,LOCATION_MZONE,1,1,nil,c:GetAttack())
	if #g>0 then
		Duel.Remove(g,POS_FACEUP,REASON_EFFECT)
	end
end
function s.thcost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(Card.IsDiscardable,tp,LOCATION_HAND,0,1,nil) end
	Duel.DiscardHand(tp,Card.IsDiscardable,1,1,REASON_COST|REASON_DISCARD)
end
function s.thfilter(c)
	if not (c:IsAbleToHand() and c:IsMonster()) then return false end
	local lv=c:GetLevel()
	if lv==7 then
		return c:IsRace(RACE_DRAGON) and c:IsAttribute(ATTRIBUTE_DARK)
	elseif lv==6 then
		return c:IsRace(RACE_MACHINE) and c:IsAttribute(ATTRIBUTE_DARK)
	elseif lv==5 then
		return c:IsRace(RACE_WARRIOR) and c:IsAttribute(ATTRIBUTE_WATER)
	else return false end
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