name: Darkness
card_text: This card cannot be Normal Summoned or Set. This card cannot be Special Summoned except by sending 1 Fiend-Type monster you control and 1 Fiend-Type monster from your hand to the Graveyard when your opponent's monster declares an attack. This card cannot be destroyed by battle. Once per turn, you can return all face-up Trap Cards you control to the hand.
lua: local s, id, o = GetID()
  function s.initial_effect(c)
  	c:EnableReviveLimit()
  	--cannot special summon
  	local e1 = Effect.CreateEffect(c)
  	e1:SetType(EFFECT_TYPE_SINGLE)
  	e1:SetProperty(EFFECT_FLAG_CANNOT_DISABLE + EFFECT_FLAG_UNCOPYABLE)
  	e1:SetCode(EFFECT_SPSUMMON_CONDITION)
  	e1:SetValue(aux.FALSE)
  	c:RegisterEffect(e1)
  	--special summon
  	local e2 = Effect.CreateEffect(c)
  	e2:SetDescription(aux.Stringid(id, 0))
  	e2:SetCategory(CATEGORY_SPECIAL_SUMMON)
  	e2:SetType(EFFECT_TYPE_FIELD + EFFECT_TYPE_TRIGGER_O)
  	e2:SetCode(EVENT_ATTACK_ANNOUNCE)
  	e2:SetRange(LOCATION_HAND)
  	e2:SetCondition(s.spcon)
  	e2:SetCost(s.spcost)
  	e2:SetTarget(s.sptg)
  	e2:SetOperation(s.spop)
  	c:RegisterEffect(e2)
  	--battle indestructable
  	local e3 = Effect.CreateEffect(c)
  	e3:SetType(EFFECT_TYPE_SINGLE)
  	e3:SetCode(EFFECT_INDESTRUCTABLE_BATTLE)
  	e3:SetValue(1)
  	c:RegisterEffect(e3)
  	--to hand
  	local e4 = Effect.CreateEffect(c)
  	e4:SetDescription(aux.Stringid(id, 1))
  	e4:SetCategory(CATEGORY_TOHAND)
  	e4:SetType(EFFECT_TYPE_IGNITION)
  	e4:SetCountLimit(1)
  	e4:SetRange(LOCATION_MZONE)
  	e4:SetTarget(s.thtg)
  	e4:SetOperation(s.thop)
  	c:RegisterEffect(e4)
  end
  function s.spcon(e, tp, eg, ep, ev, re, r, rp)
  	return ep ~= tp
  end
  function s.cfilter1(c, ft)
  	return c:IsFaceup() and c:IsRace(RACE_FIEND) and c:IsAbleToGraveAsCost() and (ft > 0 or c:GetSequence() < 5)
  end
  function s.cfilter2(c)
  	return c:IsRace(RACE_FIEND) and c:IsAbleToGraveAsCost()
  end
  function s.spcost(e, tp, eg, ep, ev, re, r, rp, chk)
  	local ft = Duel.GetLocationCount(tp, LOCATION_MZONE)
  	if chk == 0 then
  		return ft > -1 and Duel.IsExistingMatchingCard(s.cfilter1, tp, LOCATION_MZONE, 0, 1, nil, ft) and Duel.IsExistingMatchingCard(s.cfilter2, tp, LOCATION_HAND, 0, 1, e:GetHandler())
  	end
  	Duel.Hint(HINT_SELECTMSG, tp, HINTMSG_TOGRAVE)
  	local g1 = Duel.SelectMatchingCard(tp, s.cfilter1, tp, LOCATION_MZONE, 0, 1, 1, nil, ft)
  	Duel.Hint(HINT_SELECTMSG, tp, HINTMSG_TOGRAVE)
  	local g2 = Duel.SelectMatchingCard(tp, s.cfilter2, tp, LOCATION_HAND, 0, 1, 1, e:GetHandler())
  	g1:Merge(g2)
  	Duel.SendtoGrave(g1, REASON_COST)
  end
  function s.sptg(e, tp, eg, ep, ev, re, r, rp, chk)
  	if chk == 0 then
  		return e:GetHandler():IsCanBeSpecialSummoned(e, 0, tp, true, false)
  	end
  	Duel.SetOperationInfo(0, CATEGORY_SPECIAL_SUMMON, e:GetHandler(), 1, 0, 0)
  end
  function s.spop(e, tp, eg, ep, ev, re, r, rp)
  	local c = e:GetHandler()
  	if not c:IsRelateToEffect(e) then
  		return
  	end
  	if Duel.SpecialSummon(c, 0, tp, tp, true, false, POS_FACEUP) ~= 0 then
  		c:CompleteProcedure()
  	end
  end
  function s.filter(c)
  	return c:IsFaceup() and c:IsType(TYPE_TRAP) and c:IsAbleToHand()
  end
  function s.thtg(e, tp, eg, ep, ev, re, r, rp, chk)
  	if chk == 0 then
  		return Duel.IsExistingMatchingCard(s.filter, tp, LOCATION_ONFIELD, 0, 1, nil)
  	end
  	local g = Duel.GetMatchingGroup(s.filter, tp, LOCATION_ONFIELD, 0, nil)
  	Duel.SetOperationInfo(0, CATEGORY_TOHAND, g, g:GetCount(), 0, 0)
  end
  function s.thop(e, tp, eg, ep, ev, re, r, rp)
  	local g = Duel.GetMatchingGroup(s.filter, tp, LOCATION_ONFIELD, 0, nil)
  	if g:GetCount() > 0 then
  		Duel.SendtoHand(g, nil, REASON_EFFECT)
  	end
  end
  
  
source_text: Darkness
  This card cannot be Normal Summoned or Set. This card cannot be Special Summoned except by sending 1 Fiend-Type monster you control and 1 Fiend-Type monster from your hand to the Graveyard when your opponent's monster declares an attack. This card cannot be destroyed by battle. Once per turn, you can return all face-up Trap Cards you control to the hand.
target_text: -- Darkness
  local s, id, o = GetID()
  function s.initial_effect(c)
  	c:EnableReviveLimit()
  	--cannot special summon
  	local e1 = Effect.CreateEffect(c)
  	e1:SetType(EFFECT_TYPE_SINGLE)
  	e1:SetProperty(EFFECT_FLAG_CANNOT_DISABLE + EFFECT_FLAG_UNCOPYABLE)
  	e1:SetCode(EFFECT_SPSUMMON_CONDITION)
  	e1:SetValue(aux.FALSE)
  	c:RegisterEffect(e1)
  	--special summon
  	local e2 = Effect.CreateEffect(c)
  	e2:SetDescription(aux.Stringid(id, 0))
  	e2:SetCategory(CATEGORY_SPECIAL_SUMMON)
  	e2:SetType(EFFECT_TYPE_FIELD + EFFECT_TYPE_TRIGGER_O)
  	e2:SetCode(EVENT_ATTACK_ANNOUNCE)
  	e2:SetRange(LOCATION_HAND)
  	e2:SetCondition(s.spcon)
  	e2:SetCost(s.spcost)
  	e2:SetTarget(s.sptg)
  	e2:SetOperation(s.spop)
  	c:RegisterEffect(e2)
  	--battle indestructable
  	local e3 = Effect.CreateEffect(c)
  	e3:SetType(EFFECT_TYPE_SINGLE)
  	e3:SetCode(EFFECT_INDESTRUCTABLE_BATTLE)
  	e3:SetValue(1)
  	c:RegisterEffect(e3)
  	--to hand
  	local e4 = Effect.CreateEffect(c)
  	e4:SetDescription(aux.Stringid(id, 1))
  	e4:SetCategory(CATEGORY_TOHAND)
  	e4:SetType(EFFECT_TYPE_IGNITION)
  	e4:SetCountLimit(1)
  	e4:SetRange(LOCATION_MZONE)
  	e4:SetTarget(s.thtg)
  	e4:SetOperation(s.thop)
  	c:RegisterEffect(e4)
  end
  function s.spcon(e, tp, eg, ep, ev, re, r, rp)
  	return ep ~= tp
  end
  function s.cfilter1(c, ft)
  	return c:IsFaceup() and c:IsRace(RACE_FIEND) and c:IsAbleToGraveAsCost() and (ft > 0 or c:GetSequence() < 5)
  end
  function s.cfilter2(c)
  	return c:IsRace(RACE_FIEND) and c:IsAbleToGraveAsCost()
  end
  function s.spcost(e, tp, eg, ep, ev, re, r, rp, chk)
  	local ft = Duel.GetLocationCount(tp, LOCATION_MZONE)
  	if chk == 0 then
  		return ft > -1 and Duel.IsExistingMatchingCard(s.cfilter1, tp, LOCATION_MZONE, 0, 1, nil, ft) and Duel.IsExistingMatchingCard(s.cfilter2, tp, LOCATION_HAND, 0, 1, e:GetHandler())
  	end
  	Duel.Hint(HINT_SELECTMSG, tp, HINTMSG_TOGRAVE)
  	local g1 = Duel.SelectMatchingCard(tp, s.cfilter1, tp, LOCATION_MZONE, 0, 1, 1, nil, ft)
  	Duel.Hint(HINT_SELECTMSG, tp, HINTMSG_TOGRAVE)
  	local g2 = Duel.SelectMatchingCard(tp, s.cfilter2, tp, LOCATION_HAND, 0, 1, 1, e:GetHandler())
  	g1:Merge(g2)
  	Duel.SendtoGrave(g1, REASON_COST)
  end
  function s.sptg(e, tp, eg, ep, ev, re, r, rp, chk)
  	if chk == 0 then
  		return e:GetHandler():IsCanBeSpecialSummoned(e, 0, tp, true, false)
  	end
  	Duel.SetOperationInfo(0, CATEGORY_SPECIAL_SUMMON, e:GetHandler(), 1, 0, 0)
  end
  function s.spop(e, tp, eg, ep, ev, re, r, rp)
  	local c = e:GetHandler()
  	if not c:IsRelateToEffect(e) then
  		return
  	end
  	if Duel.SpecialSummon(c, 0, tp, tp, true, false, POS_FACEUP) ~= 0 then
  		c:CompleteProcedure()
  	end
  end
  function s.filter(c)
  	return c:IsFaceup() and c:IsType(TYPE_TRAP) and c:IsAbleToHand()
  end
  function s.thtg(e, tp, eg, ep, ev, re, r, rp, chk)
  	if chk == 0 then
  		return Duel.IsExistingMatchingCard(s.filter, tp, LOCATION_ONFIELD, 0, 1, nil)
  	end
  	local g = Duel.GetMatchingGroup(s.filter, tp, LOCATION_ONFIELD, 0, nil)
  	Duel.SetOperationInfo(0, CATEGORY_TOHAND, g, g:GetCount(), 0, 0)
  end
  function s.thop(e, tp, eg, ep, ev, re, r, rp)
  	local g = Duel.GetMatchingGroup(s.filter, tp, LOCATION_ONFIELD, 0, nil)
  	if g:GetCount() > 0 then
  		Duel.SendtoHand(g, nil, REASON_EFFECT)
  	end
  end
  
  