Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
This card's name becomes "Skull Servant" while it is in the Graveyard. If this card is Normal or Special Summoned: You can send 1 "Wightprince" from your Deck to the Graveyard. During either player's turn: You can send this card from your hand or field to the Graveyard; all monsters currently on the field lose ATK and DEF equal to their own Level/Rank x 300, until the end of this turn.
--ワイトプリンセス
--Wightprincess
local s,id=GetID()
function s.initial_effect(c)
	--This card's name becomes "Skull Servant" while in the GY
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e1:SetCode(EFFECT_CHANGE_CODE)
	e1:SetRange(LOCATION_GRAVE)
	e1:SetValue(CARD_SKULL_SERVANT)
	c:RegisterEffect(e1)
	--Send 1 "Wightprince" from your Deck to the GY
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_TOGRAVE)
	e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e2:SetProperty(EFFECT_FLAG_DELAY)
	e2:SetCode(EVENT_SUMMON_SUCCESS)
	e2:SetTarget(s.tgtg)
	e2:SetOperation(s.tgop)
	c:RegisterEffect(e2)
	local e3=e2:Clone()
	e3:SetCode(EVENT_SPSUMMON_SUCCESS)
	c:RegisterEffect(e3)
	--Make all monsters currently on the field lose ATK/DEF equal to their own Level/Rank x 300, until the end of that turn
	local e4=Effect.CreateEffect(c)
	e4:SetDescription(aux.Stringid(id,1))
	e4:SetCategory(CATEGORY_ATKCHANGE+CATEGORY_DEFCHANGE)
	e4:SetType(EFFECT_TYPE_QUICK_O)
	e4:SetProperty(EFFECT_FLAG_DAMAGE_STEP)
	e4:SetCode(EVENT_FREE_CHAIN)
	e4:SetRange(LOCATION_MZONE|LOCATION_HAND)
	e4:SetCondition(aux.StatChangeDamageStepCondition)
	e4:SetCost(Cost.SelfToGrave)
	e4:SetTarget(s.atkdeftg)
	e4:SetOperation(s.atkdefop)
	c:RegisterEffect(e4)
end
s.listed_names={CARD_SKULL_SERVANT,57473560} --"Wightprince"
function s.tgfilter(c)
	return c:IsCode(57473560) and c:IsAbleToGrave()
end
function s.tgtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.tgfilter,tp,LOCATION_DECK,0,1,nil) end
	Duel.SetOperationInfo(0,CATEGORY_TOGRAVE,nil,1,tp,LOCATION_DECK)
end
function s.tgop(e,tp,eg,ep,ev,re,r,rp)
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_TOGRAVE)
	local g=Duel.SelectMatchingCard(tp,s.tgfilter,tp,LOCATION_DECK,0,1,1,nil)
	if #g>0 then
		Duel.SendtoGrave(g,REASON_EFFECT)
	end
end
function s.atkdeffilter(c)
	return (c:HasLevel() or c:HasRank()) and c:IsFaceup()
end
function s.atkdeftg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.atkdeffilter,tp,LOCATION_MZONE,LOCATION_MZONE,1,e:GetHandler()) end
end
function s.atkdefop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	local g=Duel.GetMatchingGroup(s.atkdeffilter,tp,LOCATION_MZONE,LOCATION_MZONE,nil)
	for tc in g:Iter() do
		local val=tc:HasLevel() and tc:GetLevel()*-300 or tc:GetRank()*-300
		--It loses ATK/DEF equal to its own Level/Rank x 300, until the end of this turn
		local e1=Effect.CreateEffect(c)
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetProperty(EFFECT_FLAG_CANNOT_DISABLE)
		e1:SetCode(EFFECT_UPDATE_ATTACK)
		e1:SetValue(val)
		e1:SetReset(RESETS_STANDARD_PHASE_END)
		tc:RegisterEffect(e1)
		local e2=e1:Clone()
		e2:SetCode(EFFECT_UPDATE_DEFENSE)
		tc:RegisterEffect(e2)
	end
end