Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
This turn, reduce the Levels of all monsters in each player's hand by 1 (even after they are Summoned/Set). You can banish this card from the GY; this turn, reduce the Levels of all monsters in each player's hand by 1 (even after they are Summoned/Set).
--小人のいたずら
--Mischief of the Gnomes
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetHintTiming(0,TIMINGS_CHECK_MONSTER)
	e1:SetOperation(s.lvop)
	c:RegisterEffect(e1)
	--level change
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_QUICK_O)
	e2:SetCode(EVENT_FREE_CHAIN)
	e2:SetRange(LOCATION_GRAVE)
	e2:SetHintTiming(0,TIMINGS_CHECK_MONSTER)
	e2:SetCost(Cost.SelfBanish)
	e2:SetOperation(s.lvop)
	c:RegisterEffect(e2)
end
function s.lvop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	local hg=Duel.GetMatchingGroup(Card.IsLevelAbove,tp,LOCATION_HAND,LOCATION_HAND,nil,1)
	local tc=hg:GetFirst()
	for tc in aux.Next(hg) do
		local e1=Effect.CreateEffect(c)
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_UPDATE_LEVEL)
		e1:SetValue(-1)
		e1:SetReset(RESET_EVENT|(RESETS_STANDARD_PHASE_END&~RESET_TOFIELD))
		tc:RegisterEffect(e1)
	end
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_CONTINUOUS)
	e2:SetCode(EVENT_TO_HAND)
	e2:SetReset(RESET_PHASE|PHASE_END)
	e2:SetOperation(s.hlvop)
	Duel.RegisterEffect(e2,tp)
end
function s.hlvop(e,tp,eg,ep,ev,re,r,rp)
	local hg=eg:Filter(Card.IsLevelAbove,nil,1)
	local tc=hg:GetFirst()
	for tc in aux.Next(hg) do
		local e1=Effect.CreateEffect(e:GetHandler())
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_UPDATE_LEVEL)
		e1:SetValue(-1)
		e1:SetReset(RESET_EVENT|(RESETS_STANDARD_PHASE_END&~RESET_TOFIELD))
		tc:RegisterEffect(e1)
	end
end