Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If this card is Special Summoned: You can Special Summon 1 "Valkyrie" monster from your Deck, except "Valkyrie Sechste". During your Main Phase: You can send the top 2 cards of your opponent's Deck to the GY. You can only use each effect of "Valkyrie Sechste" once per turn.
--ワルキューレ・セクスト
--Valkyrie Sechste
--Scripted by Eerie Code
local s,id=GetID()
function s.initial_effect(c)
	--spsummon
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e1:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e1:SetCode(EVENT_SPSUMMON_SUCCESS)
	e1:SetProperty(EFFECT_FLAG_DELAY)
	e1:SetCountLimit(1,id)
	e1:SetTarget(s.sptg)
	e1:SetOperation(s.spop)
	c:RegisterEffect(e1)
	--gy
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,1))
	e2:SetCategory(CATEGORY_DECKDES)
	e2:SetType(EFFECT_TYPE_IGNITION)
	e2:SetRange(LOCATION_MZONE)
	e2:SetCountLimit(1,{id,1})
	e2:SetTarget(s.gytg)
	e2:SetOperation(s.gyop)
	c:RegisterEffect(e2)
end
s.listed_series={SET_VALKYRIE}
s.listed_names={id}
function s.spfilter(c,e,tp)
	return c:IsSetCard(SET_VALKYRIE) and not c:IsCode(id) and c:IsCanBeSpecialSummoned(e,0,tp,false,false)
end
function s.sptg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.GetLocationCount(tp,LOCATION_MZONE)>0
		and Duel.IsExistingMatchingCard(s.spfilter,tp,LOCATION_DECK,0,1,nil,e,tp) end
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,1,tp,LOCATION_DECK)
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	if Duel.GetLocationCount(tp,LOCATION_MZONE)<1 then return end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
	local g=Duel.SelectMatchingCard(tp,s.spfilter,tp,LOCATION_DECK,0,1,1,nil,e,tp)
	if #g>0 then
		Duel.SpecialSummon(g,0,tp,tp,false,false,POS_FACEUP)
	end
end
function s.gytg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsPlayerCanDiscardDeck(1-tp,2) end
	Duel.SetOperationInfo(0,CATEGORY_DECKDES,nil,0,1-tp,2)
end
function s.gyop(e,tp,eg,ep,ev,re,r,rp)
	Duel.DiscardDeck(1-tp,2,REASON_EFFECT)
end