Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
This card's name becomes "Cyber Dragon" while in the GY. Once per turn: You can reveal 1 Spell in your hand; this card's name becomes "Cyber Dragon" until the End Phase. If this card attacks an opponent's monster, it gains 300 ATK during the Damage Step only.
--サイバー・ドラゴン・ツヴァイ
--Cyber Dragon Zwei
local s,id=GetID()
function s.initial_effect(c)
	--atkup
	local e1=Effect.CreateEffect(c)
	e1:SetCode(EFFECT_UPDATE_ATTACK)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e1:SetRange(LOCATION_MZONE)
	e1:SetCondition(s.atkcon)
	e1:SetValue(300)
	c:RegisterEffect(e1)
	--change code
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetType(EFFECT_TYPE_IGNITION)
	e2:SetRange(LOCATION_MZONE)
	e2:SetCountLimit(1)
	e2:SetCost(s.cost)
	e2:SetOperation(s.cdop)
	c:RegisterEffect(e2)
	--code
	local e3=Effect.CreateEffect(c)
	e3:SetType(EFFECT_TYPE_SINGLE)
	e3:SetCode(EFFECT_CHANGE_CODE)
	e3:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e3:SetRange(LOCATION_GRAVE)
	e3:SetValue(CARD_CYBER_DRAGON)
	c:RegisterEffect(e3)
end
function s.atkcon(e)
	local phase=Duel.GetCurrentPhase()
	return (phase==PHASE_DAMAGE or phase==PHASE_DAMAGE_CAL)
		and Duel.GetAttacker()==e:GetHandler() and Duel.GetAttackTarget()~=nil
end
function s.costfilter(c)
	return c:IsSpell() and not c:IsPublic()
end
function s.cost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.costfilter,tp,LOCATION_HAND,0,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_CONFIRM)
	local g=Duel.SelectMatchingCard(tp,s.costfilter,tp,LOCATION_HAND,0,1,1,nil)
	Duel.ConfirmCards(1-tp,g)
	Duel.ShuffleHand(tp)
end
function s.cdop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if c:IsFacedown() or not c:IsRelateToEffect(e) then return end
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetCode(EFFECT_CHANGE_CODE)
	e1:SetProperty(EFFECT_FLAG_CANNOT_DISABLE)
	e1:SetReset(RESETS_STANDARD_PHASE_END)
	e1:SetValue(CARD_CYBER_DRAGON)
	c:RegisterEffect(e1)
end