Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
When this card is destroyed by battle and sent to the Graveyard while attacking a monster: You can Special Summon 2 "Umbral Horror" monsters from your Deck. You can only use the effect of "Umbral Horror Unform" once per turn.
--アンブラル・アンフォーム
--Umbral Horror Unform
local s,id=GetID()
function s.initial_effect(c)
	--special summon
	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_BATTLE_DESTROYED)
	e1:SetCountLimit(1,id)
	e1:SetCondition(s.spcon)
	e1:SetTarget(s.sptg)
	e1:SetOperation(s.spop)
	c:RegisterEffect(e1)
end
s.listed_series={SET_UMBRAL_HORROR}
function s.spcon(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	return Duel.GetAttacker()==c and c:IsLocation(LOCATION_GRAVE) and c:IsReason(REASON_BATTLE)
end
function s.spfilter(c,e,tp)
	return c:IsSetCard(SET_UMBRAL_HORROR) 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 not Duel.IsPlayerAffectedByEffect(tp,CARD_BLUEEYES_SPIRIT)
		and Duel.GetLocationCount(tp,LOCATION_MZONE)>1
		and Duel.IsExistingMatchingCard(s.spfilter,tp,LOCATION_DECK,0,2,nil,e,tp) end
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,2,tp,LOCATION_DECK)
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	if Duel.IsPlayerAffectedByEffect(tp,CARD_BLUEEYES_SPIRIT) then return end
	if Duel.GetLocationCount(tp,LOCATION_MZONE)<=1 then return end
	local g=Duel.GetMatchingGroup(s.spfilter,tp,LOCATION_DECK,0,nil,e,tp)
	if #g<2 then return end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
	local sg=g:Select(tp,2,2,nil)
	Duel.SpecialSummon(sg,0,tp,tp,false,false,POS_FACEUP)
end