Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
This card is treated as a Normal Monster while face-up on the field or in the GY. While this card is a Normal Monster on the field, you can Normal Summon it to have it become an Effect Monster with these effects. ● If this card is Normal or Special Summoned: You can add 1 Spell/Trap from your Deck to your hand that has "Gemini monster" in its text. You can only use this effect of "Geminize Lord Golknight" once per turn. ● This card becomes a Machine monster, also it gains 500 ATK.
--重起士道－ゴルドナイト
--Geminize Lord Golknight
--Scripted by Eerie Code
local s,id=GetID()
function s.initial_effect(c)
	Gemini.AddProcedure(c)
	--Search 1 Spell/Trap card that mentions "Gemini monster"
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_TOHAND+CATEGORY_SEARCH)
	e1:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e1:SetProperty(EFFECT_FLAG_DELAY+EFFECT_FLAG_DAMAGE_STEP)
	e1:SetCode(EVENT_SUMMON_SUCCESS)
	e1:SetCountLimit(1,id)
	e1:SetCondition(Gemini.EffectStatusCondition)
	e1:SetTarget(s.thtg)
	e1:SetOperation(s.thop)
	c:RegisterEffect(e1)
	local e2=e1:Clone()
	e2:SetCode(EVENT_SPSUMMON_SUCCESS)
	c:RegisterEffect(e2)
	--Becomes a Machine monster
	local e3=Effect.CreateEffect(c)
	e3:SetType(EFFECT_TYPE_SINGLE)
	e3:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e3:SetCode(EFFECT_CHANGE_RACE)
	e3:SetRange(LOCATION_MZONE)
	e3:SetCondition(Gemini.EffectStatusCondition)
	e3:SetValue(RACE_MACHINE)
	c:RegisterEffect(e3)
	--Gain 500 ATK
	local e4=e3:Clone()
	e4:SetCode(EFFECT_UPDATE_ATTACK)
	e4:SetValue(500)
	c:RegisterEffect(e4)
end
function s.thfilter(c)
	return c:IsSpellTrap() and c:ListsCardType(TYPE_GEMINI) 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