Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Discard 1 card; for the rest of this turn, reduce the Levels of all monsters in your hand by 2 (even after they are Summoned).
--コストダウン
--Cost Down
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:SetCost(s.cost)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
function s.cost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(Card.IsDiscardable,tp,LOCATION_HAND,0,1,e:GetHandler()) end
	Duel.DiscardHand(tp,Card.IsDiscardable,1,1,REASON_COST|REASON_DISCARD)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	local hg=Duel.GetFieldGroup(tp,LOCATION_HAND,0):Filter(Card.IsLevelAbove,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(-2)
		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.hlvfilter(c,tp)
	return c:IsLevelAbove(1) and c:IsControler(tp)
end
function s.hlvop(e,tp,eg,ep,ev,re,r,rp)
	local hg=eg:Filter(s.hlvfilter,nil,tp)
	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(-2)
		e1:SetReset(RESET_EVENT|(RESETS_STANDARD_PHASE_END&~RESET_TOFIELD))
		tc:RegisterEffect(e1)
	end
end